Finding the Fourth Proportional to 2,116.29, 2,920.49 and 1,172.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.29 : 2,920.49 = 1,172.12 : x
2. Step 2: Convert to fraction form
   2,116.29/2,920.49 = 1,172.12/x
3. Step 3: Cross multiply
   2,116.29x = 2,920.49 × 1,172.12
4. Step 4: Simplify right side
   2,116.29x = 3,423,158.88
5. Step 5: Solve for x
   x = 3,423,158.88/2,116.29
6. Step 6: Final answer
   x = 1,617.53