Finding the Fourth Proportional to 1,078.75, 1,488.72 and 637.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.75 : 1,488.72 = 637.03 : x
2. Step 2: Convert to fraction form
   1,078.75/1,488.72 = 637.03/x
3. Step 3: Cross multiply
   1,078.75x = 1,488.72 × 637.03
4. Step 4: Simplify right side
   1,078.75x = 948,359.30
5. Step 5: Solve for x
   x = 948,359.30/1,078.75
6. Step 6: Final answer
   x = 879.13