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Finding the Fourth Proportional to 72,128.34, 108,178.92 and 19,530.90

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Solution

The fourth proportional to 72,128.34, 108,178.92 and 19,530.90 is: 29,292.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,128.34 : 108,178.92 = 19,530.90 : x
  2. Step 2: Convert to fraction form
    72,128.34/108,178.92 = 19,530.90/x
  3. Step 3: Cross multiply
    72,128.34x = 108,178.92 × 19,530.90
  4. Step 4: Simplify right side
    72,128.34x = 2,112,831,668.63
  5. Step 5: Solve for x
    x = 2,112,831,668.63/72,128.34
  6. Step 6: Final answer
    x = 29,292.67

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