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Finding the Fourth Proportional to 485,869.20, 728,803.80 and 420,915.30

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Solution

The fourth proportional to 485,869.20, 728,803.80 and 420,915.30 is: 631,372.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,869.20 : 728,803.80 = 420,915.30 : x
  2. Step 2: Convert to fraction form
    485,869.20/728,803.80 = 420,915.30/x
  3. Step 3: Cross multiply
    485,869.20x = 728,803.80 × 420,915.30
  4. Step 4: Simplify right side
    485,869.20x = 306,764,670,118.14
  5. Step 5: Solve for x
    x = 306,764,670,118.14/485,869.20
  6. Step 6: Final answer
    x = 631,372.95

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