Finding the Fourth Proportional to 22,656.20, 31,264.72 and 12,585.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,656.20 : 31,264.72 = 12,585.30 : x
2. Step 2: Convert to fraction form
   22,656.20/31,264.72 = 12,585.30/x
3. Step 3: Cross multiply
   22,656.20x = 31,264.72 × 12,585.30
4. Step 4: Simplify right side
   22,656.20x = 393,475,880.62
5. Step 5: Solve for x
   x = 393,475,880.62/22,656.20
6. Step 6: Final answer
   x = 17,367.25