Finding the Fourth Proportional to 1,104.67, 1,524.59 and 638.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,104.67 : 1,524.59 = 638.92 : x
2. Step 2: Convert to fraction form
   1,104.67/1,524.59 = 638.92/x
3. Step 3: Cross multiply
   1,104.67x = 1,524.59 × 638.92
4. Step 4: Simplify right side
   1,104.67x = 974,091.04
5. Step 5: Solve for x
   x = 974,091.04/1,104.67
6. Step 6: Final answer
   x = 881.79