Finding the Fourth Proportional to 1,076.39, 1,485.60 and 634.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.39 : 1,485.60 = 634.31 : x
2. Step 2: Convert to fraction form
   1,076.39/1,485.60 = 634.31/x
3. Step 3: Cross multiply
   1,076.39x = 1,485.60 × 634.31
4. Step 4: Simplify right side
   1,076.39x = 942,323.51
5. Step 5: Solve for x
   x = 942,323.51/1,076.39
6. Step 6: Final answer
   x = 875.45