Finding the Fourth Proportional to 2,116.43, 2,920.62 and 1,172.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.43 : 2,920.62 = 1,172.34 : x
2. Step 2: Convert to fraction form
   2,116.43/2,920.62 = 1,172.34/x
3. Step 3: Cross multiply
   2,116.43x = 2,920.62 × 1,172.34
4. Step 4: Simplify right side
   2,116.43x = 3,423,964.05
5. Step 5: Solve for x
   x = 3,423,964.05/2,116.43
6. Step 6: Final answer
   x = 1,617.80