Finding the Fourth Proportional to 22,621.56, 31,217.76 and 12,685.56

Step by Step Solution

1. Step 1: Write the proportion equation
   22,621.56 : 31,217.76 = 12,685.56 : x
2. Step 2: Convert to fraction form
   22,621.56/31,217.76 = 12,685.56/x
3. Step 3: Cross multiply
   22,621.56x = 31,217.76 × 12,685.56
4. Step 4: Simplify right side
   22,621.56x = 396,014,767.55
5. Step 5: Solve for x
   x = 396,014,767.55/22,621.56
6. Step 6: Final answer
   x = 17,506.08