Finding the Fourth Proportional to 7,715.39, 10,647.27 and 4,178.61

Step by Step Solution

1. Step 1: Write the proportion equation
   7,715.39 : 10,647.27 = 4,178.61 : x
2. Step 2: Convert to fraction form
   7,715.39/10,647.27 = 4,178.61/x
3. Step 3: Cross multiply
   7,715.39x = 10,647.27 × 4,178.61
4. Step 4: Simplify right side
   7,715.39x = 44,490,788.89
5. Step 5: Solve for x
   x = 44,490,788.89/7,715.39
6. Step 6: Final answer
   x = 5,766.50