Finding the Fourth Proportional to 12,685.20, 17,505.48 and 7,383.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.20 : 17,505.48 = 7,383.12 : x
2. Step 2: Convert to fraction form
   12,685.20/17,505.48 = 7,383.12/x
3. Step 3: Cross multiply
   12,685.20x = 17,505.48 × 7,383.12
4. Step 4: Simplify right side
   12,685.20x = 129,245,059.50
5. Step 5: Solve for x
   x = 129,245,059.50/12,685.20
6. Step 6: Final answer
   x = 10,188.65