Finding the Fourth Proportional to 2,760.50, 4,140.05 and 812.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,760.50 : 4,140.05 = 812.25 : x
2. Step 2: Convert to fraction form
   2,760.50/4,140.05 = 812.25/x
3. Step 3: Cross multiply
   2,760.50x = 4,140.05 × 812.25
4. Step 4: Simplify right side
   2,760.50x = 3,362,751.55
5. Step 5: Solve for x
   x = 3,362,751.55/2,760.50
6. Step 6: Final answer
   x = 1,218.17