Finding the Fourth Proportional to 1,103.76, 1,523.10 and 638.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,103.76 : 1,523.10 = 638.04 : x
2. Step 2: Convert to fraction form
   1,103.76/1,523.10 = 638.04/x
3. Step 3: Cross multiply
   1,103.76x = 1,523.10 × 638.04
4. Step 4: Simplify right side
   1,103.76x = 971,798.72
5. Step 5: Solve for x
   x = 971,798.72/1,103.76
6. Step 6: Final answer
   x = 880.44