Finding the Fourth Proportional to 31,978.43, 47,940.29 and 12,271.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,978.43 : 47,940.29 = 12,271.13 : x
2. Step 2: Convert to fraction form
   31,978.43/47,940.29 = 12,271.13/x
3. Step 3: Cross multiply
   31,978.43x = 47,940.29 × 12,271.13
4. Step 4: Simplify right side
   31,978.43x = 588,281,229.77
5. Step 5: Solve for x
   x = 588,281,229.77/31,978.43
6. Step 6: Final answer
   x = 18,396.19