Finding the Fourth Proportional to 8,158.10, 11,315.94 and 7,878.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,158.10 : 11,315.94 = 7,878.38 : x
2. Step 2: Convert to fraction form
   8,158.10/11,315.94 = 7,878.38/x
3. Step 3: Cross multiply
   8,158.10x = 11,315.94 × 7,878.38
4. Step 4: Simplify right side
   8,158.10x = 89,151,275.38
5. Step 5: Solve for x
   x = 89,151,275.38/8,158.10
6. Step 6: Final answer
   x = 10,927.95