Finding the Fourth Proportional to 2,111.80, 3,168.24 and 812.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.80 : 3,168.24 = 812.92 : x
2. Step 2: Convert to fraction form
   2,111.80/3,168.24 = 812.92/x
3. Step 3: Cross multiply
   2,111.80x = 3,168.24 × 812.92
4. Step 4: Simplify right side
   2,111.80x = 2,575,525.66
5. Step 5: Solve for x
   x = 2,575,525.66/2,111.80
6. Step 6: Final answer
   x = 1,219.59