Finding the Fourth Proportional to 1,055.39, 1,456.49 and 635.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.39 : 1,456.49 = 635.87 : x
2. Step 2: Convert to fraction form
   1,055.39/1,456.49 = 635.87/x
3. Step 3: Cross multiply
   1,055.39x = 1,456.49 × 635.87
4. Step 4: Simplify right side
   1,055.39x = 926,138.30
5. Step 5: Solve for x
   x = 926,138.30/1,055.39
6. Step 6: Final answer
   x = 877.53