Finding the Fourth Proportional to 2,186.48, 3,278.05 and 1,091.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.48 : 3,278.05 = 1,091.61 : x
2. Step 2: Convert to fraction form
   2,186.48/3,278.05 = 1,091.61/x
3. Step 3: Cross multiply
   2,186.48x = 3,278.05 × 1,091.61
4. Step 4: Simplify right side
   2,186.48x = 3,578,352.16
5. Step 5: Solve for x
   x = 3,578,352.16/2,186.48
6. Step 6: Final answer
   x = 1,636.58