Finding the Fourth Proportional to 9,215.09, 12,715.55 and 5,438.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,215.09 : 12,715.55 = 5,438.42 : x
2. Step 2: Convert to fraction form
   9,215.09/12,715.55 = 5,438.42/x
3. Step 3: Cross multiply
   9,215.09x = 12,715.55 × 5,438.42
4. Step 4: Simplify right side
   9,215.09x = 69,152,410.66
5. Step 5: Solve for x
   x = 69,152,410.66/9,215.09
6. Step 6: Final answer
   x = 7,504.26