Finding the Fourth Proportional to 1,076.55, 1,485.74 and 634.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.55 : 1,485.74 = 634.23 : x
2. Step 2: Convert to fraction form
   1,076.55/1,485.74 = 634.23/x
3. Step 3: Cross multiply
   1,076.55x = 1,485.74 × 634.23
4. Step 4: Simplify right side
   1,076.55x = 942,300.88
5. Step 5: Solve for x
   x = 942,300.88/1,076.55
6. Step 6: Final answer
   x = 875.30