Finding the Fourth Proportional to 1,076.56, 1,485.42 and 634.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.56 : 1,485.42 = 634.30 : x
2. Step 2: Convert to fraction form
   1,076.56/1,485.42 = 634.30/x
3. Step 3: Cross multiply
   1,076.56x = 1,485.42 × 634.30
4. Step 4: Simplify right side
   1,076.56x = 942,201.91
5. Step 5: Solve for x
   x = 942,201.91/1,076.56
6. Step 6: Final answer
   x = 875.20