Finding the Fourth Proportional to 22,557.96, 31,132.33 and 12,998.23

Step by Step Solution

1. Step 1: Write the proportion equation
   22,557.96 : 31,132.33 = 12,998.23 : x
2. Step 2: Convert to fraction form
   22,557.96/31,132.33 = 12,998.23/x
3. Step 3: Cross multiply
   22,557.96x = 31,132.33 × 12,998.23
4. Step 4: Simplify right side
   22,557.96x = 404,665,075.45
5. Step 5: Solve for x
   x = 404,665,075.45/22,557.96
6. Step 6: Final answer
   x = 17,938.90