Finding the Fourth Proportional to 1,043.59, 1,440.15 and 571.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,043.59 : 1,440.15 = 571.48 : x
2. Step 2: Convert to fraction form
   1,043.59/1,440.15 = 571.48/x
3. Step 3: Cross multiply
   1,043.59x = 1,440.15 × 571.48
4. Step 4: Simplify right side
   1,043.59x = 823,016.92
5. Step 5: Solve for x
   x = 823,016.92/1,043.59
6. Step 6: Final answer
   x = 788.64