Finding the Fourth Proportional to 1,086.24, 1,498.92 and 638.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.24 : 1,498.92 = 638.16 : x
2. Step 2: Convert to fraction form
   1,086.24/1,498.92 = 638.16/x
3. Step 3: Cross multiply
   1,086.24x = 1,498.92 × 638.16
4. Step 4: Simplify right side
   1,086.24x = 956,550.79
5. Step 5: Solve for x
   x = 956,550.79/1,086.24
6. Step 6: Final answer
   x = 880.61