Finding the Fourth Proportional to 13,155.89, 18,158.78 and 8,120.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.89 : 18,158.78 = 8,120.93 : x
2. Step 2: Convert to fraction form
   13,155.89/18,158.78 = 8,120.93/x
3. Step 3: Cross multiply
   13,155.89x = 18,158.78 × 8,120.93
4. Step 4: Simplify right side
   13,155.89x = 147,466,110.77
5. Step 5: Solve for x
   x = 147,466,110.77/13,155.89
6. Step 6: Final answer
   x = 11,209.14