Finding the Fourth Proportional to 31,128.18, 42,956.73 and 16,981.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.18 : 42,956.73 = 16,981.62 : x
2. Step 2: Convert to fraction form
   31,128.18/42,956.73 = 16,981.62/x
3. Step 3: Cross multiply
   31,128.18x = 42,956.73 × 16,981.62
4. Step 4: Simplify right side
   31,128.18x = 729,474,865.30
5. Step 5: Solve for x
   x = 729,474,865.30/31,128.18
6. Step 6: Final answer
   x = 23,434.55