Finding the Fourth Proportional to 31,992.62, 47,978.52 and 10,639.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,992.62 : 47,978.52 = 10,639.59 : x
2. Step 2: Convert to fraction form
   31,992.62/47,978.52 = 10,639.59/x
3. Step 3: Cross multiply
   31,992.62x = 47,978.52 × 10,639.59
4. Step 4: Simplify right side
   31,992.62x = 510,471,781.61
5. Step 5: Solve for x
   x = 510,471,781.61/31,992.62
6. Step 6: Final answer
   x = 15,955.92