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Finding the Fourth Proportional to 65,870.48, 90,718.84 and 56,915.12

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Solution

The fourth proportional to 65,870.48, 90,718.84 and 56,915.12 is: 78,385.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,870.48 : 90,718.84 = 56,915.12 : x
  2. Step 2: Convert to fraction form
    65,870.48/90,718.84 = 56,915.12/x
  3. Step 3: Cross multiply
    65,870.48x = 90,718.84 × 56,915.12
  4. Step 4: Simplify right side
    65,870.48x = 5,163,273,664.86
  5. Step 5: Solve for x
    x = 5,163,273,664.86/65,870.48
  6. Step 6: Final answer
    x = 78,385.24

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