Finding the Fourth Proportional to 1,076.40, 1,485.27 and 634.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.40 : 1,485.27 = 634.46 : x
2. Step 2: Convert to fraction form
   1,076.40/1,485.27 = 634.46/x
3. Step 3: Cross multiply
   1,076.40x = 1,485.27 × 634.46
4. Step 4: Simplify right side
   1,076.40x = 942,336.98
5. Step 5: Solve for x
   x = 942,336.98/1,076.40
6. Step 6: Final answer
   x = 875.45