Finding the Fourth Proportional to 8,431.92, 12,630.72 and 5,134.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,431.92 : 12,630.72 = 5,134.32 : x
2. Step 2: Convert to fraction form
   8,431.92/12,630.72 = 5,134.32/x
3. Step 3: Cross multiply
   8,431.92x = 12,630.72 × 5,134.32
4. Step 4: Simplify right side
   8,431.92x = 64,850,158.31
5. Step 5: Solve for x
   x = 64,850,158.31/8,431.92
6. Step 6: Final answer
   x = 7,691.03