Finding the Fourth Proportional to 1,103.75, 1,523.24 and 638.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.75 : 1,523.24 = 638.15 : x
2. Step 2: Convert to fraction form
   1,103.75/1,523.24 = 638.15/x
3. Step 3: Cross multiply
   1,103.75x = 1,523.24 × 638.15
4. Step 4: Simplify right side
   1,103.75x = 972,055.61
5. Step 5: Solve for x
   x = 972,055.61/1,103.75
6. Step 6: Final answer
   x = 880.68