Finding the Fourth Proportional to 11,404.56, 17,089.56 and 8,469.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,404.56 : 17,089.56 = 8,469.20 : x
2. Step 2: Convert to fraction form
   11,404.56/17,089.56 = 8,469.20/x
3. Step 3: Cross multiply
   11,404.56x = 17,089.56 × 8,469.20
4. Step 4: Simplify right side
   11,404.56x = 144,734,901.55
5. Step 5: Solve for x
   x = 144,734,901.55/11,404.56
6. Step 6: Final answer
   x = 12,690.97