Finding the Fourth Proportional to 12,517.89, 17,276.81 and 7,215.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,517.89 : 17,276.81 = 7,215.79 : x
2. Step 2: Convert to fraction form
   12,517.89/17,276.81 = 7,215.79/x
3. Step 3: Cross multiply
   12,517.89x = 17,276.81 × 7,215.79
4. Step 4: Simplify right side
   12,517.89x = 124,665,832.83
5. Step 5: Solve for x
   x = 124,665,832.83/12,517.89
6. Step 6: Final answer
   x = 9,959.01