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Finding the Fourth Proportional to 21,913.96, 30,239.58 and 12,960.76

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Solution

The fourth proportional to 21,913.96, 30,239.58 and 12,960.76 is: 17,884.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,913.96 : 30,239.58 = 12,960.76 : x
  2. Step 2: Convert to fraction form
    21,913.96/30,239.58 = 12,960.76/x
  3. Step 3: Cross multiply
    21,913.96x = 30,239.58 × 12,960.76
  4. Step 4: Simplify right side
    21,913.96x = 391,927,938.88
  5. Step 5: Solve for x
    x = 391,927,938.88/21,913.96
  6. Step 6: Final answer
    x = 17,884.85

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