Finding the Fourth Proportional to 1,086.22, 1,499.04 and 638.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.22 : 1,499.04 = 638.12 : x
2. Step 2: Convert to fraction form
   1,086.22/1,499.04 = 638.12/x
3. Step 3: Cross multiply
   1,086.22x = 1,499.04 × 638.12
4. Step 4: Simplify right side
   1,086.22x = 956,563.30
5. Step 5: Solve for x
   x = 956,563.30/1,086.22
6. Step 6: Final answer
   x = 880.63