Finding the Fourth Proportional to 1,055.71, 1,456.75 and 636.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.71 : 1,456.75 = 636.05 : x
2. Step 2: Convert to fraction form
   1,055.71/1,456.75 = 636.05/x
3. Step 3: Cross multiply
   1,055.71x = 1,456.75 × 636.05
4. Step 4: Simplify right side
   1,055.71x = 926,562.66
5. Step 5: Solve for x
   x = 926,562.66/1,055.71
6. Step 6: Final answer
   x = 877.67