Finding the Fourth Proportional to 1,042.83, 1,563.03 and 579.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.83 : 1,563.03 = 579.78 : x
2. Step 2: Convert to fraction form
   1,042.83/1,563.03 = 579.78/x
3. Step 3: Cross multiply
   1,042.83x = 1,563.03 × 579.78
4. Step 4: Simplify right side
   1,042.83x = 906,213.53
5. Step 5: Solve for x
   x = 906,213.53/1,042.83
6. Step 6: Final answer
   x = 868.99