Finding the Fourth Proportional to 1,103.38, 1,522.72 and 637.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.38 : 1,522.72 = 637.78 : x
2. Step 2: Convert to fraction form
   1,103.38/1,522.72 = 637.78/x
3. Step 3: Cross multiply
   1,103.38x = 1,522.72 × 637.78
4. Step 4: Simplify right side
   1,103.38x = 971,160.36
5. Step 5: Solve for x
   x = 971,160.36/1,103.38
6. Step 6: Final answer
   x = 880.17