Finding the Fourth Proportional to 1,086.41, 1,499.25 and 638.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.41 : 1,499.25 = 638.18 : x
2. Step 2: Convert to fraction form
   1,086.41/1,499.25 = 638.18/x
3. Step 3: Cross multiply
   1,086.41x = 1,499.25 × 638.18
4. Step 4: Simplify right side
   1,086.41x = 956,783.87
5. Step 5: Solve for x
   x = 956,783.87/1,086.41
6. Step 6: Final answer
   x = 880.69