Finding the Fourth Proportional to 12,839.68, 17,715 and 7,534.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,839.68 : 17,715 = 7,534.72 : x
2. Step 2: Convert to fraction form
   12,839.68/17,715 = 7,534.72/x
3. Step 3: Cross multiply
   12,839.68x = 17,715 × 7,534.72
4. Step 4: Simplify right side
   12,839.68x = 133,477,564.80
5. Step 5: Solve for x
   x = 133,477,564.80/12,839.68
6. Step 6: Final answer
   x = 10,395.71