Finding the Fourth Proportional to 12,469.76, 17,215.04 and 9,109.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,469.76 : 17,215.04 = 9,109.12 : x
2. Step 2: Convert to fraction form
   12,469.76/17,215.04 = 9,109.12/x
3. Step 3: Cross multiply
   12,469.76x = 17,215.04 × 9,109.12
4. Step 4: Simplify right side
   12,469.76x = 156,813,865.16
5. Step 5: Solve for x
   x = 156,813,865.16/12,469.76
6. Step 6: Final answer
   x = 12,575.53