Finding the Fourth Proportional to 2,439.99, 3,659.72 and 1,123.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.99 : 3,659.72 = 1,123.29 : x
2. Step 2: Convert to fraction form
   2,439.99/3,659.72 = 1,123.29/x
3. Step 3: Cross multiply
   2,439.99x = 3,659.72 × 1,123.29
4. Step 4: Simplify right side
   2,439.99x = 4,110,921.26
5. Step 5: Solve for x
   x = 4,110,921.26/2,439.99
6. Step 6: Final answer
   x = 1,684.81