Finding the Fourth Proportional to 31,128.59, 42,957.39 and 16,981.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.59 : 42,957.39 = 16,981.43 : x
2. Step 2: Convert to fraction form
   31,128.59/42,957.39 = 16,981.43/x
3. Step 3: Cross multiply
   31,128.59x = 42,957.39 × 16,981.43
4. Step 4: Simplify right side
   31,128.59x = 729,477,953.72
5. Step 5: Solve for x
   x = 729,477,953.72/31,128.59
6. Step 6: Final answer
   x = 23,434.34