Finding the Fourth Proportional to 1,452.10, 2,003.55 and 862.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,452.10 : 2,003.55 = 862.78 : x
2. Step 2: Convert to fraction form
   1,452.10/2,003.55 = 862.78/x
3. Step 3: Cross multiply
   1,452.10x = 2,003.55 × 862.78
4. Step 4: Simplify right side
   1,452.10x = 1,728,622.87
5. Step 5: Solve for x
   x = 1,728,622.87/1,452.10
6. Step 6: Final answer
   x = 1,190.43