Finding the Fourth Proportional to 2,788.48, 4,176.12 and 2,421.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,788.48 : 4,176.12 = 2,421.28 : x
2. Step 2: Convert to fraction form
   2,788.48/4,176.12 = 2,421.28/x
3. Step 3: Cross multiply
   2,788.48x = 4,176.12 × 2,421.28
4. Step 4: Simplify right side
   2,788.48x = 10,111,555.83
5. Step 5: Solve for x
   x = 10,111,555.83/2,788.48
6. Step 6: Final answer
   x = 3,626.19