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Finding the Fourth Proportional to 660.03, 991.85 and 477.78

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Solution

The fourth proportional to 660.03, 991.85 and 477.78 is: 717.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.03 : 991.85 = 477.78 : x
  2. Step 2: Convert to fraction form
    660.03/991.85 = 477.78/x
  3. Step 3: Cross multiply
    660.03x = 991.85 × 477.78
  4. Step 4: Simplify right side
    660.03x = 473,883.70
  5. Step 5: Solve for x
    x = 473,883.70/660.03
  6. Step 6: Final answer
    x = 717.97

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