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Finding the Fourth Proportional to 717.80, 990.84 and 423.04

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Solution

The fourth proportional to 717.80, 990.84 and 423.04 is: 583.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.80 : 990.84 = 423.04 : x
  2. Step 2: Convert to fraction form
    717.80/990.84 = 423.04/x
  3. Step 3: Cross multiply
    717.80x = 990.84 × 423.04
  4. Step 4: Simplify right side
    717.80x = 419,164.95
  5. Step 5: Solve for x
    x = 419,164.95/717.80
  6. Step 6: Final answer
    x = 583.96

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