Finding the Fourth Proportional to 2,112.30, 3,166.53 and 813.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.30 : 3,166.53 = 813.42 : x
2. Step 2: Convert to fraction form
   2,112.30/3,166.53 = 813.42/x
3. Step 3: Cross multiply
   2,112.30x = 3,166.53 × 813.42
4. Step 4: Simplify right side
   2,112.30x = 2,575,718.83
5. Step 5: Solve for x
   x = 2,575,718.83/2,112.30
6. Step 6: Final answer
   x = 1,219.39