Finding the Fourth Proportional to 8,278.05, 12,425.31 and 5,158.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,278.05 : 12,425.31 = 5,158.86 : x
2. Step 2: Convert to fraction form
   8,278.05/12,425.31 = 5,158.86/x
3. Step 3: Cross multiply
   8,278.05x = 12,425.31 × 5,158.86
4. Step 4: Simplify right side
   8,278.05x = 64,100,434.75
5. Step 5: Solve for x
   x = 64,100,434.75/8,278.05
6. Step 6: Final answer
   x = 7,743.42