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Finding the Fourth Proportional to 30,578.91, 42,176.85 and 18,642.75

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Solution

The fourth proportional to 30,578.91, 42,176.85 and 18,642.75 is: 25,713.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,578.91 : 42,176.85 = 18,642.75 : x
  2. Step 2: Convert to fraction form
    30,578.91/42,176.85 = 18,642.75/x
  3. Step 3: Cross multiply
    30,578.91x = 42,176.85 × 18,642.75
  4. Step 4: Simplify right side
    30,578.91x = 786,292,470.34
  5. Step 5: Solve for x
    x = 786,292,470.34/30,578.91
  6. Step 6: Final answer
    x = 25,713.55

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