Finding the Fourth Proportional to 9,118.50, 13,659.89 and 8,126.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.50 : 13,659.89 = 8,126.72 : x
2. Step 2: Convert to fraction form
   9,118.50/13,659.89 = 8,126.72/x
3. Step 3: Cross multiply
   9,118.50x = 13,659.89 × 8,126.72
4. Step 4: Simplify right side
   9,118.50x = 111,010,101.26
5. Step 5: Solve for x
   x = 111,010,101.26/9,118.50
6. Step 6: Final answer
   x = 12,174.17