Finding the Fourth Proportional to 13,158.45, 18,158.18 and 7,493.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.45 : 18,158.18 = 7,493.78 : x
2. Step 2: Convert to fraction form
   13,158.45/18,158.18 = 7,493.78/x
3. Step 3: Cross multiply
   13,158.45x = 18,158.18 × 7,493.78
4. Step 4: Simplify right side
   13,158.45x = 136,073,414.05
5. Step 5: Solve for x
   x = 136,073,414.05/13,158.45
6. Step 6: Final answer
   x = 10,341.14