Finding the Fourth Proportional to 2,111.10, 3,167.10 and 812.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.10 : 3,167.10 = 812.56 : x
2. Step 2: Convert to fraction form
   2,111.10/3,167.10 = 812.56/x
3. Step 3: Cross multiply
   2,111.10x = 3,167.10 × 812.56
4. Step 4: Simplify right side
   2,111.10x = 2,573,458.78
5. Step 5: Solve for x
   x = 2,573,458.78/2,111.10
6. Step 6: Final answer
   x = 1,219.01