Finding the Fourth Proportional to 2,116.62, 3,173.37 and 817.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.62 : 3,173.37 = 817.50 : x
2. Step 2: Convert to fraction form
   2,116.62/3,173.37 = 817.50/x
3. Step 3: Cross multiply
   2,116.62x = 3,173.37 × 817.50
4. Step 4: Simplify right side
   2,116.62x = 2,594,229.98
5. Step 5: Solve for x
   x = 2,594,229.98/2,116.62
6. Step 6: Final answer
   x = 1,225.65