Finding the Fourth Proportional to 1,050.04, 1,573.35 and 639.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.04 : 1,573.35 = 639.31 : x
2. Step 2: Convert to fraction form
   1,050.04/1,573.35 = 639.31/x
3. Step 3: Cross multiply
   1,050.04x = 1,573.35 × 639.31
4. Step 4: Simplify right side
   1,050.04x = 1,005,858.39
5. Step 5: Solve for x
   x = 1,005,858.39/1,050.04
6. Step 6: Final answer
   x = 957.92