Finding the Fourth Proportional to 31,693.32, 47,520.54 and 14,139

Step by Step Solution

1. Step 1: Write the proportion equation
   31,693.32 : 47,520.54 = 14,139 : x
2. Step 2: Convert to fraction form
   31,693.32/47,520.54 = 14,139/x
3. Step 3: Cross multiply
   31,693.32x = 47,520.54 × 14,139
4. Step 4: Simplify right side
   31,693.32x = 671,892,915.06
5. Step 5: Solve for x
   x = 671,892,915.06/31,693.32
6. Step 6: Final answer
   x = 21,199.83