Finding the Fourth Proportional to 2,111.32, 3,168.30 and 812.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.32 : 3,168.30 = 812.92 : x
2. Step 2: Convert to fraction form
   2,111.32/3,168.30 = 812.92/x
3. Step 3: Cross multiply
   2,111.32x = 3,168.30 × 812.92
4. Step 4: Simplify right side
   2,111.32x = 2,575,574.44
5. Step 5: Solve for x
   x = 2,575,574.44/2,111.32
6. Step 6: Final answer
   x = 1,219.89