Finding the Fourth Proportional to 2,111.30, 3,167.49 and 812.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.30 : 3,167.49 = 812.42 : x
2. Step 2: Convert to fraction form
   2,111.30/3,167.49 = 812.42/x
3. Step 3: Cross multiply
   2,111.30x = 3,167.49 × 812.42
4. Step 4: Simplify right side
   2,111.30x = 2,573,332.23
5. Step 5: Solve for x
   x = 2,573,332.23/2,111.30
6. Step 6: Final answer
   x = 1,218.84