Finding the Fourth Proportional to 2,788.27, 4,179.78 and 938.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,788.27 : 4,179.78 = 938.09 : x
2. Step 2: Convert to fraction form
   2,788.27/4,179.78 = 938.09/x
3. Step 3: Cross multiply
   2,788.27x = 4,179.78 × 938.09
4. Step 4: Simplify right side
   2,788.27x = 3,920,988.92
5. Step 5: Solve for x
   x = 3,920,988.92/2,788.27
6. Step 6: Final answer
   x = 1,406.25