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Finding the Fourth Proportional to 520,121.40, 778,869.90 and 415,145.40

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Solution

The fourth proportional to 520,121.40, 778,869.90 and 415,145.40 is: 621,670.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,121.40 : 778,869.90 = 415,145.40 : x
  2. Step 2: Convert to fraction form
    520,121.40/778,869.90 = 415,145.40/x
  3. Step 3: Cross multiply
    520,121.40x = 778,869.90 × 415,145.40
  4. Step 4: Simplify right side
    520,121.40x = 323,344,256,183.46
  5. Step 5: Solve for x
    x = 323,344,256,183.46/520,121.40
  6. Step 6: Final answer
    x = 621,670.74

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