Finding the Fourth Proportional to 1,076.78, 1,485.59 and 634.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.78 : 1,485.59 = 634.37 : x
2. Step 2: Convert to fraction form
   1,076.78/1,485.59 = 634.37/x
3. Step 3: Cross multiply
   1,076.78x = 1,485.59 × 634.37
4. Step 4: Simplify right side
   1,076.78x = 942,403.13
5. Step 5: Solve for x
   x = 942,403.13/1,076.78
6. Step 6: Final answer
   x = 875.21