Finding the Fourth Proportional to 12,309.60, 18,467.52 and 3,545.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.60 : 18,467.52 = 3,545.28 : x
2. Step 2: Convert to fraction form
   12,309.60/18,467.52 = 3,545.28/x
3. Step 3: Cross multiply
   12,309.60x = 18,467.52 × 3,545.28
4. Step 4: Simplify right side
   12,309.60x = 65,472,529.31
5. Step 5: Solve for x
   x = 65,472,529.31/12,309.60
6. Step 6: Final answer
   x = 5,318.82