Finding the Fourth Proportional to 1,050.72, 1,449.96 and 578.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.72 : 1,449.96 = 578.64 : x
2. Step 2: Convert to fraction form
   1,050.72/1,449.96 = 578.64/x
3. Step 3: Cross multiply
   1,050.72x = 1,449.96 × 578.64
4. Step 4: Simplify right side
   1,050.72x = 839,004.85
5. Step 5: Solve for x
   x = 839,004.85/1,050.72
6. Step 6: Final answer
   x = 798.50