Finding the Fourth Proportional to 31,129.02, 42,956.55 and 16,981.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,129.02 : 42,956.55 = 16,981.02 : x
2. Step 2: Convert to fraction form
   31,129.02/42,956.55 = 16,981.02/x
3. Step 3: Cross multiply
   31,129.02x = 42,956.55 × 16,981.02
4. Step 4: Simplify right side
   31,129.02x = 729,446,034.68
5. Step 5: Solve for x
   x = 729,446,034.68/31,129.02
6. Step 6: Final answer
   x = 23,432.99