Finding the Fourth Proportional to 1,055.59, 1,456.78 and 635.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.59 : 1,456.78 = 635.94 : x
2. Step 2: Convert to fraction form
   1,055.59/1,456.78 = 635.94/x
3. Step 3: Cross multiply
   1,055.59x = 1,456.78 × 635.94
4. Step 4: Simplify right side
   1,055.59x = 926,424.67
5. Step 5: Solve for x
   x = 926,424.67/1,055.59
6. Step 6: Final answer
   x = 877.64