Finding the Fourth Proportional to 1,076.75, 1,485.59 and 634.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.75 : 1,485.59 = 634.49 : x
2. Step 2: Convert to fraction form
   1,076.75/1,485.59 = 634.49/x
3. Step 3: Cross multiply
   1,076.75x = 1,485.59 × 634.49
4. Step 4: Simplify right side
   1,076.75x = 942,581.40
5. Step 5: Solve for x
   x = 942,581.40/1,076.75
6. Step 6: Final answer
   x = 875.40