Finding the Fourth Proportional to 2,116.01, 3,172.18 and 818.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.01 : 3,172.18 = 818.39 : x
2. Step 2: Convert to fraction form
   2,116.01/3,172.18 = 818.39/x
3. Step 3: Cross multiply
   2,116.01x = 3,172.18 × 818.39
4. Step 4: Simplify right side
   2,116.01x = 2,596,080.39
5. Step 5: Solve for x
   x = 2,596,080.39/2,116.01
6. Step 6: Final answer
   x = 1,226.88