Finding the Fourth Proportional to 22,561.34, 31,127.48 and 13,128.08

Step by Step Solution

1. Step 1: Write the proportion equation
   22,561.34 : 31,127.48 = 13,128.08 : x
2. Step 2: Convert to fraction form
   22,561.34/31,127.48 = 13,128.08/x
3. Step 3: Cross multiply
   22,561.34x = 31,127.48 × 13,128.08
4. Step 4: Simplify right side
   22,561.34x = 408,644,047.64
5. Step 5: Solve for x
   x = 408,644,047.64/22,561.34
6. Step 6: Final answer
   x = 18,112.58