Finding the Fourth Proportional to 2,628.92, 3,942.83 and 985.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.92 : 3,942.83 = 985.59 : x
2. Step 2: Convert to fraction form
   2,628.92/3,942.83 = 985.59/x
3. Step 3: Cross multiply
   2,628.92x = 3,942.83 × 985.59
4. Step 4: Simplify right side
   2,628.92x = 3,886,008.89
5. Step 5: Solve for x
   x = 3,886,008.89/2,628.92
6. Step 6: Final answer
   x = 1,478.18