Finding the Fourth Proportional to 1,076.88, 1,485.92 and 634.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.88 : 1,485.92 = 634.72 : x
2. Step 2: Convert to fraction form
   1,076.88/1,485.92 = 634.72/x
3. Step 3: Cross multiply
   1,076.88x = 1,485.92 × 634.72
4. Step 4: Simplify right side
   1,076.88x = 943,144.41
5. Step 5: Solve for x
   x = 943,144.41/1,076.88
6. Step 6: Final answer
   x = 875.81