Finding the Fourth Proportional to 22,561.09, 31,139.31 and 13,135.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,561.09 : 31,139.31 = 13,135.12 : x
2. Step 2: Convert to fraction form
   22,561.09/31,139.31 = 13,135.12/x
3. Step 3: Cross multiply
   22,561.09x = 31,139.31 × 13,135.12
4. Step 4: Simplify right side
   22,561.09x = 409,018,573.57
5. Step 5: Solve for x
   x = 409,018,573.57/22,561.09
6. Step 6: Final answer
   x = 18,129.38