Finding the Fourth Proportional to 2,116.50, 3,172.94 and 818.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.50 : 3,172.94 = 818.88 : x
2. Step 2: Convert to fraction form
   2,116.50/3,172.94 = 818.88/x
3. Step 3: Cross multiply
   2,116.50x = 3,172.94 × 818.88
4. Step 4: Simplify right side
   2,116.50x = 2,598,257.11
5. Step 5: Solve for x
   x = 2,598,257.11/2,116.50
6. Step 6: Final answer
   x = 1,227.62