Finding the Fourth Proportional to 1,015.48, 1,400.78 and 611.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.48 : 1,400.78 = 611.43 : x
2. Step 2: Convert to fraction form
   1,015.48/1,400.78 = 611.43/x
3. Step 3: Cross multiply
   1,015.48x = 1,400.78 × 611.43
4. Step 4: Simplify right side
   1,015.48x = 856,472.04
5. Step 5: Solve for x
   x = 856,472.04/1,015.48
6. Step 6: Final answer
   x = 843.42