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Finding the Fourth Proportional to 86,978, 130,467 and 21,314

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Solution

The fourth proportional to 86,978, 130,467 and 21,314 is: 31,971

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,978 : 130,467 = 21,314 : x
  2. Step 2: Convert to fraction form
    86,978/130,467 = 21,314/x
  3. Step 3: Cross multiply
    86,978x = 130,467 × 21,314
  4. Step 4: Simplify right side
    86,978x = 2,780,773,638
  5. Step 5: Solve for x
    x = 2,780,773,638/86,978
  6. Step 6: Final answer
    x = 31,971

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