Finding the Fourth Proportional to 1,076.30, 1,485.37 and 634.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.30 : 1,485.37 = 634.55 : x
2. Step 2: Convert to fraction form
   1,076.30/1,485.37 = 634.55/x
3. Step 3: Cross multiply
   1,076.30x = 1,485.37 × 634.55
4. Step 4: Simplify right side
   1,076.30x = 942,534.90
5. Step 5: Solve for x
   x = 942,534.90/1,076.30
6. Step 6: Final answer
   x = 875.72