Finding the Fourth Proportional to 2,116.24, 2,920.39 and 1,172.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.24 : 2,920.39 = 1,172.04 : x
2. Step 2: Convert to fraction form
   2,116.24/2,920.39 = 1,172.04/x
3. Step 3: Cross multiply
   2,116.24x = 2,920.39 × 1,172.04
4. Step 4: Simplify right side
   2,116.24x = 3,422,813.90
5. Step 5: Solve for x
   x = 3,422,813.90/2,116.24
6. Step 6: Final answer
   x = 1,617.40