Finding the Fourth Proportional to 1,050.96, 1,574.71 and 638.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.96 : 1,574.71 = 638.85 : x
2. Step 2: Convert to fraction form
   1,050.96/1,574.71 = 638.85/x
3. Step 3: Cross multiply
   1,050.96x = 1,574.71 × 638.85
4. Step 4: Simplify right side
   1,050.96x = 1,006,003.48
5. Step 5: Solve for x
   x = 1,006,003.48/1,050.96
6. Step 6: Final answer
   x = 957.22