Finding the Fourth Proportional to 12,411.72, 18,617.76 and 3,646.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,411.72 : 18,617.76 = 3,646.80 : x
2. Step 2: Convert to fraction form
   12,411.72/18,617.76 = 3,646.80/x
3. Step 3: Cross multiply
   12,411.72x = 18,617.76 × 3,646.80
4. Step 4: Simplify right side
   12,411.72x = 67,895,247.17
5. Step 5: Solve for x
   x = 67,895,247.17/12,411.72
6. Step 6: Final answer
   x = 5,470.25