Finding the Fourth Proportional to 7,399.72, 11,109.30 and 5,209.48

Step by Step Solution

1. Step 1: Write the proportion equation
   7,399.72 : 11,109.30 = 5,209.48 : x
2. Step 2: Convert to fraction form
   7,399.72/11,109.30 = 5,209.48/x
3. Step 3: Cross multiply
   7,399.72x = 11,109.30 × 5,209.48
4. Step 4: Simplify right side
   7,399.72x = 57,873,676.16
5. Step 5: Solve for x
   x = 57,873,676.16/7,399.72
6. Step 6: Final answer
   x = 7,821.06