Finding the Fourth Proportional to 9,109.46, 13,679.55 and 8,641.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.46 : 13,679.55 = 8,641.82 : x
2. Step 2: Convert to fraction form
   9,109.46/13,679.55 = 8,641.82/x
3. Step 3: Cross multiply
   9,109.46x = 13,679.55 × 8,641.82
4. Step 4: Simplify right side
   9,109.46x = 118,216,208.78
5. Step 5: Solve for x
   x = 118,216,208.78/9,109.46
6. Step 6: Final answer
   x = 12,977.30