Finding the Fourth Proportional to 2,111.62, 3,168.18 and 812.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.62 : 3,168.18 = 812.74 : x
2. Step 2: Convert to fraction form
   2,111.62/3,168.18 = 812.74/x
3. Step 3: Cross multiply
   2,111.62x = 3,168.18 × 812.74
4. Step 4: Simplify right side
   2,111.62x = 2,574,906.61
5. Step 5: Solve for x
   x = 2,574,906.61/2,111.62
6. Step 6: Final answer
   x = 1,219.40