Finding the Fourth Proportional to 12,255.48, 18,410.55 and 7,578.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,255.48 : 18,410.55 = 7,578.93 : x
2. Step 2: Convert to fraction form
   12,255.48/18,410.55 = 7,578.93/x
3. Step 3: Cross multiply
   12,255.48x = 18,410.55 × 7,578.93
4. Step 4: Simplify right side
   12,255.48x = 139,532,269.71
5. Step 5: Solve for x
   x = 139,532,269.71/12,255.48
6. Step 6: Final answer
   x = 11,385.30