Finding the Fourth Proportional to 1,050.47, 1,573.96 and 638.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.47 : 1,573.96 = 638.35 : x
2. Step 2: Convert to fraction form
   1,050.47/1,573.96 = 638.35/x
3. Step 3: Cross multiply
   1,050.47x = 1,573.96 × 638.35
4. Step 4: Simplify right side
   1,050.47x = 1,004,737.37
5. Step 5: Solve for x
   x = 1,004,737.37/1,050.47
6. Step 6: Final answer
   x = 956.47