Finding the Fourth Proportional to 11,081.46, 16,618.95 and 9,128.82

Step by Step Solution

1. Step 1: Write the proportion equation
   11,081.46 : 16,618.95 = 9,128.82 : x
2. Step 2: Convert to fraction form
   11,081.46/16,618.95 = 9,128.82/x
3. Step 3: Cross multiply
   11,081.46x = 16,618.95 × 9,128.82
4. Step 4: Simplify right side
   11,081.46x = 151,711,403.14
5. Step 5: Solve for x
   x = 151,711,403.14/11,081.46
6. Step 6: Final answer
   x = 13,690.56