Finding the Fourth Proportional to 31,128.14, 42,956.82 and 16,981.08

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.14 : 42,956.82 = 16,981.08 : x
2. Step 2: Convert to fraction form
   31,128.14/42,956.82 = 16,981.08/x
3. Step 3: Cross multiply
   31,128.14x = 42,956.82 × 16,981.08
4. Step 4: Simplify right side
   31,128.14x = 729,453,196.97
5. Step 5: Solve for x
   x = 729,453,196.97/31,128.14
6. Step 6: Final answer
   x = 23,433.88