Finding the Fourth Proportional to 12,155.08, 18,230.28 and 5,132.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.08 : 18,230.28 = 5,132.78 : x
2. Step 2: Convert to fraction form
   12,155.08/18,230.28 = 5,132.78/x
3. Step 3: Cross multiply
   12,155.08x = 18,230.28 × 5,132.78
4. Step 4: Simplify right side
   12,155.08x = 93,572,016.58
5. Step 5: Solve for x
   x = 93,572,016.58/12,155.08
6. Step 6: Final answer
   x = 7,698.18