Finding the Fourth Proportional to 1,050.57, 1,449.72 and 578.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.57 : 1,449.72 = 578.38 : x
2. Step 2: Convert to fraction form
   1,050.57/1,449.72 = 578.38/x
3. Step 3: Cross multiply
   1,050.57x = 1,449.72 × 578.38
4. Step 4: Simplify right side
   1,050.57x = 838,478.91
5. Step 5: Solve for x
   x = 838,478.91/1,050.57
6. Step 6: Final answer
   x = 798.12