Finding the Fourth Proportional to 2,760.59, 4,140.98 and 812.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,760.59 : 4,140.98 = 812.78 : x
2. Step 2: Convert to fraction form
   2,760.59/4,140.98 = 812.78/x
3. Step 3: Cross multiply
   2,760.59x = 4,140.98 × 812.78
4. Step 4: Simplify right side
   2,760.59x = 3,365,680.96
5. Step 5: Solve for x
   x = 3,365,680.96/2,760.59
6. Step 6: Final answer
   x = 1,219.19