Finding the Fourth Proportional to 2,661.86, 3,990.94 and 1,180.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.86 : 3,990.94 = 1,180.28 : x
2. Step 2: Convert to fraction form
   2,661.86/3,990.94 = 1,180.28/x
3. Step 3: Cross multiply
   2,661.86x = 3,990.94 × 1,180.28
4. Step 4: Simplify right side
   2,661.86x = 4,710,426.66
5. Step 5: Solve for x
   x = 4,710,426.66/2,661.86
6. Step 6: Final answer
   x = 1,769.60