Finding the Fourth Proportional to 1,077.75, 1,487.34 and 636.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.75 : 1,487.34 = 636.03 : x
2. Step 2: Convert to fraction form
   1,077.75/1,487.34 = 636.03/x
3. Step 3: Cross multiply
   1,077.75x = 1,487.34 × 636.03
4. Step 4: Simplify right side
   1,077.75x = 945,992.86
5. Step 5: Solve for x
   x = 945,992.86/1,077.75
6. Step 6: Final answer
   x = 877.75