Finding the Fourth Proportional to 8,271.47, 12,378.60 and 5,107.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,271.47 : 12,378.60 = 5,107.61 : x
2. Step 2: Convert to fraction form
   8,271.47/12,378.60 = 5,107.61/x
3. Step 3: Cross multiply
   8,271.47x = 12,378.60 × 5,107.61
4. Step 4: Simplify right side
   8,271.47x = 63,225,061.15
5. Step 5: Solve for x
   x = 63,225,061.15/8,271.47
6. Step 6: Final answer
   x = 7,643.75