Finding the Fourth Proportional to 31,128.63, 42,957.63 and 16,981.77

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.63 : 42,957.63 = 16,981.77 : x
2. Step 2: Convert to fraction form
   31,128.63/42,957.63 = 16,981.77/x
3. Step 3: Cross multiply
   31,128.63x = 42,957.63 × 16,981.77
4. Step 4: Simplify right side
   31,128.63x = 729,496,592.41
5. Step 5: Solve for x
   x = 729,496,592.41/31,128.63
6. Step 6: Final answer
   x = 23,434.91