Finding the Fourth Proportional to 2,659.86, 3,990.83 and 1,120.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.86 : 3,990.83 = 1,120.98 : x
2. Step 2: Convert to fraction form
   2,659.86/3,990.83 = 1,120.98/x
3. Step 3: Cross multiply
   2,659.86x = 3,990.83 × 1,120.98
4. Step 4: Simplify right side
   2,659.86x = 4,473,640.61
5. Step 5: Solve for x
   x = 4,473,640.61/2,659.86
6. Step 6: Final answer
   x = 1,681.91