Finding the Fourth Proportional to 8,118.38, 12,158.12 and 5,146.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,118.38 : 12,158.12 = 5,146.49 : x
2. Step 2: Convert to fraction form
   8,118.38/12,158.12 = 5,146.49/x
3. Step 3: Cross multiply
   8,118.38x = 12,158.12 × 5,146.49
4. Step 4: Simplify right side
   8,118.38x = 62,571,657.31
5. Step 5: Solve for x
   x = 62,571,657.31/8,118.38
6. Step 6: Final answer
   x = 7,707.40