Finding the Fourth Proportional to 31,134.56, 42,974.90 and 21,706.16

Step by Step Solution

1. Step 1: Write the proportion equation
   31,134.56 : 42,974.90 = 21,706.16 : x
2. Step 2: Convert to fraction form
   31,134.56/42,974.90 = 21,706.16/x
3. Step 3: Cross multiply
   31,134.56x = 42,974.90 × 21,706.16
4. Step 4: Simplify right side
   31,134.56x = 932,819,731.98
5. Step 5: Solve for x
   x = 932,819,731.98/31,134.56
6. Step 6: Final answer
   x = 29,960.91