Finding the Fourth Proportional to 9,715.15, 14,569.05 and 3,139.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,715.15 : 14,569.05 = 3,139.57 : x
2. Step 2: Convert to fraction form
   9,715.15/14,569.05 = 3,139.57/x
3. Step 3: Cross multiply
   9,715.15x = 14,569.05 × 3,139.57
4. Step 4: Simplify right side
   9,715.15x = 45,740,552.31
5. Step 5: Solve for x
   x = 45,740,552.31/9,715.15
6. Step 6: Final answer
   x = 4,708.17