Finding the Fourth Proportional to 2,116.69, 2,920.96 and 1,172.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.69 : 2,920.96 = 1,172.52 : x
2. Step 2: Convert to fraction form
   2,116.69/2,920.96 = 1,172.52/x
3. Step 3: Cross multiply
   2,116.69x = 2,920.96 × 1,172.52
4. Step 4: Simplify right side
   2,116.69x = 3,424,878.16
5. Step 5: Solve for x
   x = 3,424,878.16/2,116.69
6. Step 6: Final answer
   x = 1,618.03