Finding the Fourth Proportional to 9,215.39, 12,716.80 and 5,440.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,215.39 : 12,716.80 = 5,440.79 : x
2. Step 2: Convert to fraction form
   9,215.39/12,716.80 = 5,440.79/x
3. Step 3: Cross multiply
   9,215.39x = 12,716.80 × 5,440.79
4. Step 4: Simplify right side
   9,215.39x = 69,189,456.46
5. Step 5: Solve for x
   x = 69,189,456.46/9,215.39
6. Step 6: Final answer
   x = 7,508.03