Finding the Fourth Proportional to 22,756.90, 31,404.68 and 12,685.99

Step by Step Solution

1. Step 1: Write the proportion equation
   22,756.90 : 31,404.68 = 12,685.99 : x
2. Step 2: Convert to fraction form
   22,756.90/31,404.68 = 12,685.99/x
3. Step 3: Cross multiply
   22,756.90x = 31,404.68 × 12,685.99
4. Step 4: Simplify right side
   22,756.90x = 398,399,456.43
5. Step 5: Solve for x
   x = 398,399,456.43/22,756.90
6. Step 6: Final answer
   x = 17,506.75