Finding the Fourth Proportional to 17,111.76, 25,643.16 and 7,728.48

Step by Step Solution

1. Step 1: Write the proportion equation
   17,111.76 : 25,643.16 = 7,728.48 : x
2. Step 2: Convert to fraction form
   17,111.76/25,643.16 = 7,728.48/x
3. Step 3: Cross multiply
   17,111.76x = 25,643.16 × 7,728.48
4. Step 4: Simplify right side
   17,111.76x = 198,182,649.20
5. Step 5: Solve for x
   x = 198,182,649.20/17,111.76
6. Step 6: Final answer
   x = 11,581.66