Finding the Fourth Proportional to 3,911.69, 5,399.06 and 2,421.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.69 : 5,399.06 = 2,421.09 : x
2. Step 2: Convert to fraction form
   3,911.69/5,399.06 = 2,421.09/x
3. Step 3: Cross multiply
   3,911.69x = 5,399.06 × 2,421.09
4. Step 4: Simplify right side
   3,911.69x = 13,071,598.07
5. Step 5: Solve for x
   x = 13,071,598.07/3,911.69
6. Step 6: Final answer
   x = 3,341.67