Finding the Fourth Proportional to 1,103.89, 1,523.43 and 638.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.89 : 1,523.43 = 638.14 : x
2. Step 2: Convert to fraction form
   1,103.89/1,523.43 = 638.14/x
3. Step 3: Cross multiply
   1,103.89x = 1,523.43 × 638.14
4. Step 4: Simplify right side
   1,103.89x = 972,161.62
5. Step 5: Solve for x
   x = 972,161.62/1,103.89
6. Step 6: Final answer
   x = 880.67