Finding the Fourth Proportional to 22,758.78, 31,403.29 and 12,685.02

Step by Step Solution

1. Step 1: Write the proportion equation
   22,758.78 : 31,403.29 = 12,685.02 : x
2. Step 2: Convert to fraction form
   22,758.78/31,403.29 = 12,685.02/x
3. Step 3: Cross multiply
   22,758.78x = 31,403.29 × 12,685.02
4. Step 4: Simplify right side
   22,758.78x = 398,351,361.72
5. Step 5: Solve for x
   x = 398,351,361.72/22,758.78
6. Step 6: Final answer
   x = 17,503.19