Finding the Fourth Proportional to 11,215.32, 16,828.73 and 7,708.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,215.32 : 16,828.73 = 7,708.15 : x
2. Step 2: Convert to fraction form
   11,215.32/16,828.73 = 7,708.15/x
3. Step 3: Cross multiply
   11,215.32x = 16,828.73 × 7,708.15
4. Step 4: Simplify right side
   11,215.32x = 129,718,291.89
5. Step 5: Solve for x
   x = 129,718,291.89/11,215.32
6. Step 6: Final answer
   x = 11,566.17