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Finding the Fourth Proportional to 663,776.15, 915,774.86 and 391,707.87

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Solution

The fourth proportional to 663,776.15, 915,774.86 and 391,707.87 is: 540,417.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,776.15 : 915,774.86 = 391,707.87 : x
  2. Step 2: Convert to fraction form
    663,776.15/915,774.86 = 391,707.87/x
  3. Step 3: Cross multiply
    663,776.15x = 915,774.86 × 391,707.87
  4. Step 4: Simplify right side
    663,776.15x = 358,716,217,851.61
  5. Step 5: Solve for x
    x = 358,716,217,851.61/663,776.15
  6. Step 6: Final answer
    x = 540,417.46

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