Finding the Fourth Proportional to 31,087.29, 42,825.40 and 25,687.22

Step by Step Solution

1. Step 1: Write the proportion equation
   31,087.29 : 42,825.40 = 25,687.22 : x
2. Step 2: Convert to fraction form
   31,087.29/42,825.40 = 25,687.22/x
3. Step 3: Cross multiply
   31,087.29x = 42,825.40 × 25,687.22
4. Step 4: Simplify right side
   31,087.29x = 1,100,065,471.39
5. Step 5: Solve for x
   x = 1,100,065,471.39/31,087.29
6. Step 6: Final answer
   x = 35,386.34