Finding the Fourth Proportional to 9,798.88, 13,513.24 and 7,557.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,798.88 : 13,513.24 = 7,557.20 : x
2. Step 2: Convert to fraction form
   9,798.88/13,513.24 = 7,557.20/x
3. Step 3: Cross multiply
   9,798.88x = 13,513.24 × 7,557.20
4. Step 4: Simplify right side
   9,798.88x = 102,122,300.56
5. Step 5: Solve for x
   x = 102,122,300.56/9,798.88
6. Step 6: Final answer
   x = 10,421.84