Finding the Fourth Proportional to 22,786.79, 31,445.72 and 12,715.13

Step by Step Solution

1. Step 1: Write the proportion equation
   22,786.79 : 31,445.72 = 12,715.13 : x
2. Step 2: Convert to fraction form
   22,786.79/31,445.72 = 12,715.13/x
3. Step 3: Cross multiply
   22,786.79x = 31,445.72 × 12,715.13
4. Step 4: Simplify right side
   22,786.79x = 399,836,196.94
5. Step 5: Solve for x
   x = 399,836,196.94/22,786.79
6. Step 6: Final answer
   x = 17,546.84