Finding the Fourth Proportional to 1,104.17, 1,523.76 and 638.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,104.17 : 1,523.76 = 638.42 : x
2. Step 2: Convert to fraction form
   1,104.17/1,523.76 = 638.42/x
3. Step 3: Cross multiply
   1,104.17x = 1,523.76 × 638.42
4. Step 4: Simplify right side
   1,104.17x = 972,798.86
5. Step 5: Solve for x
   x = 972,798.86/1,104.17
6. Step 6: Final answer
   x = 881.02