Finding the Fourth Proportional to 1,050.72, 1,449.97 and 578.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.72 : 1,449.97 = 578.55 : x
2. Step 2: Convert to fraction form
   1,050.72/1,449.97 = 578.55/x
3. Step 3: Cross multiply
   1,050.72x = 1,449.97 × 578.55
4. Step 4: Simplify right side
   1,050.72x = 838,880.14
5. Step 5: Solve for x
   x = 838,880.14/1,050.72
6. Step 6: Final answer
   x = 798.39