Finding the Fourth Proportional to 2,628.05, 3,942.07 and 985.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.05 : 3,942.07 = 985.37 : x
2. Step 2: Convert to fraction form
   2,628.05/3,942.07 = 985.37/x
3. Step 3: Cross multiply
   2,628.05x = 3,942.07 × 985.37
4. Step 4: Simplify right side
   2,628.05x = 3,884,404.91
5. Step 5: Solve for x
   x = 3,884,404.91/2,628.05
6. Step 6: Final answer
   x = 1,478.05