Finding the Fourth Proportional to 2,120.91, 3,182.31 and 1,145.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.91 : 3,182.31 = 1,145.88 : x
2. Step 2: Convert to fraction form
   2,120.91/3,182.31 = 1,145.88/x
3. Step 3: Cross multiply
   2,120.91x = 3,182.31 × 1,145.88
4. Step 4: Simplify right side
   2,120.91x = 3,646,545.38
5. Step 5: Solve for x
   x = 3,646,545.38/2,120.91
6. Step 6: Final answer
   x = 1,719.33