Finding the Fourth Proportional to 12,105.60, 16,982.40 and 12,105.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,105.60 : 16,982.40 = 12,105.60 : x
2. Step 2: Convert to fraction form
   12,105.60/16,982.40 = 12,105.60/x
3. Step 3: Cross multiply
   12,105.60x = 16,982.40 × 12,105.60
4. Step 4: Simplify right side
   12,105.60x = 205,582,141.44
5. Step 5: Solve for x
   x = 205,582,141.44/12,105.60
6. Step 6: Final answer
   x = 16,982.40