Finding the Fourth Proportional to 21,162.40, 31,744.91 and 5,580.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.40 : 31,744.91 = 5,580.03 : x
2. Step 2: Convert to fraction form
   21,162.40/31,744.91 = 5,580.03/x
3. Step 3: Cross multiply
   21,162.40x = 31,744.91 × 5,580.03
4. Step 4: Simplify right side
   21,162.40x = 177,137,550.15
5. Step 5: Solve for x
   x = 177,137,550.15/21,162.40
6. Step 6: Final answer
   x = 8,370.39