Finding the Fourth Proportional to 8,404.80, 12,594.40 and 7,099.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,404.80 : 12,594.40 = 7,099.20 : x
2. Step 2: Convert to fraction form
   8,404.80/12,594.40 = 7,099.20/x
3. Step 3: Cross multiply
   8,404.80x = 12,594.40 × 7,099.20
4. Step 4: Simplify right side
   8,404.80x = 89,410,164.48
5. Step 5: Solve for x
   x = 89,410,164.48/8,404.80
6. Step 6: Final answer
   x = 10,637.99