Finding the Fourth Proportional to 942.12, 1,300.77 and 648.09

Step by Step Solution

1. Step 1: Write the proportion equation
   942.12 : 1,300.77 = 648.09 : x
2. Step 2: Convert to fraction form
   942.12/1,300.77 = 648.09/x
3. Step 3: Cross multiply
   942.12x = 1,300.77 × 648.09
4. Step 4: Simplify right side
   942.12x = 843,016.03
5. Step 5: Solve for x
   x = 843,016.03/942.12
6. Step 6: Final answer
   x = 894.81