Finding the Fourth Proportional to 9,713.68, 14,570.42 and 3,139.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,713.68 : 14,570.42 = 3,139.72 : x
2. Step 2: Convert to fraction form
   9,713.68/14,570.42 = 3,139.72/x
3. Step 3: Cross multiply
   9,713.68x = 14,570.42 × 3,139.72
4. Step 4: Simplify right side
   9,713.68x = 45,746,986.96
5. Step 5: Solve for x
   x = 45,746,986.96/9,713.68
6. Step 6: Final answer
   x = 4,709.54