Finding the Fourth Proportional to 12,445.86, 18,663.92 and 5,515.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,445.86 : 18,663.92 = 5,515.50 : x
2. Step 2: Convert to fraction form
   12,445.86/18,663.92 = 5,515.50/x
3. Step 3: Cross multiply
   12,445.86x = 18,663.92 × 5,515.50
4. Step 4: Simplify right side
   12,445.86x = 102,940,850.76
5. Step 5: Solve for x
   x = 102,940,850.76/12,445.86
6. Step 6: Final answer
   x = 8,271.09