Finding the Fourth Proportional to 2,099.30, 3,145.31 and 1,123.66

Step by Step Solution

1. Step 1: Write the proportion equation
   2,099.30 : 3,145.31 = 1,123.66 : x
2. Step 2: Convert to fraction form
   2,099.30/3,145.31 = 1,123.66/x
3. Step 3: Cross multiply
   2,099.30x = 3,145.31 × 1,123.66
4. Step 4: Simplify right side
   2,099.30x = 3,534,259.03
5. Step 5: Solve for x
   x = 3,534,259.03/2,099.30
6. Step 6: Final answer
   x = 1,683.54