Finding the Fourth Proportional to 8,715.33, 11,980.85 and 7,499.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,715.33 : 11,980.85 = 7,499.59 : x
2. Step 2: Convert to fraction form
   8,715.33/11,980.85 = 7,499.59/x
3. Step 3: Cross multiply
   8,715.33x = 11,980.85 × 7,499.59
4. Step 4: Simplify right side
   8,715.33x = 89,851,395.40
5. Step 5: Solve for x
   x = 89,851,395.40/8,715.33
6. Step 6: Final answer
   x = 10,309.58