Finding the Fourth Proportional to 7,139.31, 10,713.81 and 2,522.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,139.31 : 10,713.81 = 2,522.31 : x
2. Step 2: Convert to fraction form
   7,139.31/10,713.81 = 2,522.31/x
3. Step 3: Cross multiply
   7,139.31x = 10,713.81 × 2,522.31
4. Step 4: Simplify right side
   7,139.31x = 27,023,550.10
5. Step 5: Solve for x
   x = 27,023,550.10/7,139.31
6. Step 6: Final answer
   x = 3,785.18