Finding the Fourth Proportional to 31,128.85, 42,957.73 and 16,981.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.85 : 42,957.73 = 16,981.59 : x
2. Step 2: Convert to fraction form
   31,128.85/42,957.73 = 16,981.59/x
3. Step 3: Cross multiply
   31,128.85x = 42,957.73 × 16,981.59
4. Step 4: Simplify right side
   31,128.85x = 729,490,644.99
5. Step 5: Solve for x
   x = 729,490,644.99/31,128.85
6. Step 6: Final answer
   x = 23,434.55