Finding the Fourth Proportional to 2,116.43, 2,920.78 and 1,172.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.43 : 2,920.78 = 1,172.33 : x
2. Step 2: Convert to fraction form
   2,116.43/2,920.78 = 1,172.33/x
3. Step 3: Cross multiply
   2,116.43x = 2,920.78 × 1,172.33
4. Step 4: Simplify right side
   2,116.43x = 3,424,106.34
5. Step 5: Solve for x
   x = 3,424,106.34/2,116.43
6. Step 6: Final answer
   x = 1,617.87