Finding the Fourth Proportional to 9,908.31, 13,661.51 and 8,561.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,908.31 : 13,661.51 = 8,561.48 : x
2. Step 2: Convert to fraction form
   9,908.31/13,661.51 = 8,561.48/x
3. Step 3: Cross multiply
   9,908.31x = 13,661.51 × 8,561.48
4. Step 4: Simplify right side
   9,908.31x = 116,962,701.83
5. Step 5: Solve for x
   x = 116,962,701.83/9,908.31
6. Step 6: Final answer
   x = 11,804.51