Finding the Fourth Proportional to 12,419.20, 17,136.60 and 7,383.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,419.20 : 17,136.60 = 7,383.31 : x
2. Step 2: Convert to fraction form
   12,419.20/17,136.60 = 7,383.31/x
3. Step 3: Cross multiply
   12,419.20x = 17,136.60 × 7,383.31
4. Step 4: Simplify right side
   12,419.20x = 126,524,830.15
5. Step 5: Solve for x
   x = 126,524,830.15/12,419.20
6. Step 6: Final answer
   x = 10,187.84