Finding the Fourth Proportional to 22,500.18, 31,048.38 and 12,939.57

Step by Step Solution

1. Step 1: Write the proportion equation
   22,500.18 : 31,048.38 = 12,939.57 : x
2. Step 2: Convert to fraction form
   22,500.18/31,048.38 = 12,939.57/x
3. Step 3: Cross multiply
   22,500.18x = 31,048.38 × 12,939.57
4. Step 4: Simplify right side
   22,500.18x = 401,752,686.40
5. Step 5: Solve for x
   x = 401,752,686.40/22,500.18
6. Step 6: Final answer
   x = 17,855.53