Finding the Fourth Proportional to 1,124.48, 1,685.25 and 576.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,124.48 : 1,685.25 = 576.78 : x
2. Step 2: Convert to fraction form
   1,124.48/1,685.25 = 576.78/x
3. Step 3: Cross multiply
   1,124.48x = 1,685.25 × 576.78
4. Step 4: Simplify right side
   1,124.48x = 972,018.50
5. Step 5: Solve for x
   x = 972,018.50/1,124.48
6. Step 6: Final answer
   x = 864.42