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Finding the Fourth Proportional to 78,987.26, 109,002.30 and 47,174.78

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Solution

The fourth proportional to 78,987.26, 109,002.30 and 47,174.78 is: 65,101.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,987.26 : 109,002.30 = 47,174.78 : x
  2. Step 2: Convert to fraction form
    78,987.26/109,002.30 = 47,174.78/x
  3. Step 3: Cross multiply
    78,987.26x = 109,002.30 × 47,174.78
  4. Step 4: Simplify right side
    78,987.26x = 5,142,159,521.99
  5. Step 5: Solve for x
    x = 5,142,159,521.99/78,987.26
  6. Step 6: Final answer
    x = 65,101.13

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