Finding the Fourth Proportional to 2,117.24, 2,920.51 and 1,399.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.24 : 2,920.51 = 1,399.42 : x
2. Step 2: Convert to fraction form
   2,117.24/2,920.51 = 1,399.42/x
3. Step 3: Cross multiply
   2,117.24x = 2,920.51 × 1,399.42
4. Step 4: Simplify right side
   2,117.24x = 4,087,020.10
5. Step 5: Solve for x
   x = 4,087,020.10/2,117.24
6. Step 6: Final answer
   x = 1,930.35