Finding the Fourth Proportional to 31,242.50, 43,114.46 and 28,700.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,242.50 : 43,114.46 = 28,700.78 : x
2. Step 2: Convert to fraction form
   31,242.50/43,114.46 = 28,700.78/x
3. Step 3: Cross multiply
   31,242.50x = 43,114.46 × 28,700.78
4. Step 4: Simplify right side
   31,242.50x = 1,237,418,810.82
5. Step 5: Solve for x
   x = 1,237,418,810.82/31,242.50
6. Step 6: Final answer
   x = 39,606.91