Finding the Fourth Proportional to 22,557.40, 31,130.28 and 12,998.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,557.40 : 31,130.28 = 12,998.72 : x
2. Step 2: Convert to fraction form
   22,557.40/31,130.28 = 12,998.72/x
3. Step 3: Cross multiply
   22,557.40x = 31,130.28 × 12,998.72
4. Step 4: Simplify right side
   22,557.40x = 404,653,686.34
5. Step 5: Solve for x
   x = 404,653,686.34/22,557.40
6. Step 6: Final answer
   x = 17,938.84