Finding the Fourth Proportional to 2,659.77, 3,989.94 and 1,099.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.77 : 3,989.94 = 1,099.89 : x
2. Step 2: Convert to fraction form
   2,659.77/3,989.94 = 1,099.89/x
3. Step 3: Cross multiply
   2,659.77x = 3,989.94 × 1,099.89
4. Step 4: Simplify right side
   2,659.77x = 4,388,490.98
5. Step 5: Solve for x
   x = 4,388,490.98/2,659.77
6. Step 6: Final answer
   x = 1,649.95