Finding the Fourth Proportional to 9,891.55, 13,656.71 and 8,827.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,891.55 : 13,656.71 = 8,827.49 : x
2. Step 2: Convert to fraction form
   9,891.55/13,656.71 = 8,827.49/x
3. Step 3: Cross multiply
   9,891.55x = 13,656.71 × 8,827.49
4. Step 4: Simplify right side
   9,891.55x = 120,554,470.96
5. Step 5: Solve for x
   x = 120,554,470.96/9,891.55
6. Step 6: Final answer
   x = 12,187.62