Finding the Fourth Proportional to 2,116.78, 3,175.32 and 818.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.78 : 3,175.32 = 818.22 : x
2. Step 2: Convert to fraction form
   2,116.78/3,175.32 = 818.22/x
3. Step 3: Cross multiply
   2,116.78x = 3,175.32 × 818.22
4. Step 4: Simplify right side
   2,116.78x = 2,598,110.33
5. Step 5: Solve for x
   x = 2,598,110.33/2,116.78
6. Step 6: Final answer
   x = 1,227.39