Finding the Fourth Proportional to 7,715.52, 10,647.42 and 4,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,715.52 : 10,647.42 = 4,178.72 : x
2. Step 2: Convert to fraction form
   7,715.52/10,647.42 = 4,178.72/x
3. Step 3: Cross multiply
   7,715.52x = 10,647.42 × 4,178.72
4. Step 4: Simplify right side
   7,715.52x = 44,492,586.90
5. Step 5: Solve for x
   x = 44,492,586.90/7,715.52
6. Step 6: Final answer
   x = 5,766.63