Finding the Fourth Proportional to 2,165.57, 3,243.15 and 1,238.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.57 : 3,243.15 = 1,238.32 : x
2. Step 2: Convert to fraction form
   2,165.57/3,243.15 = 1,238.32/x
3. Step 3: Cross multiply
   2,165.57x = 3,243.15 × 1,238.32
4. Step 4: Simplify right side
   2,165.57x = 4,016,041.29
5. Step 5: Solve for x
   x = 4,016,041.29/2,165.57
6. Step 6: Final answer
   x = 1,854.50