Finding the Fourth Proportional to 2,659.96, 3,990.47 and 1,100.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.96 : 3,990.47 = 1,100.19 : x
2. Step 2: Convert to fraction form
   2,659.96/3,990.47 = 1,100.19/x
3. Step 3: Cross multiply
   2,659.96x = 3,990.47 × 1,100.19
4. Step 4: Simplify right side
   2,659.96x = 4,390,269.69
5. Step 5: Solve for x
   x = 4,390,269.69/2,659.96
6. Step 6: Final answer
   x = 1,650.50