Finding the Fourth Proportional to 2,616.52, 3,920.17 and 1,381.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,616.52 : 3,920.17 = 1,381.21 : x
2. Step 2: Convert to fraction form
   2,616.52/3,920.17 = 1,381.21/x
3. Step 3: Cross multiply
   2,616.52x = 3,920.17 × 1,381.21
4. Step 4: Simplify right side
   2,616.52x = 5,414,551.50
5. Step 5: Solve for x
   x = 5,414,551.50/2,616.52
6. Step 6: Final answer
   x = 2,069.37