Finding the Fourth Proportional to 12,665.74, 18,996.96 and 3,900.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.74 : 18,996.96 = 3,900.46 : x
2. Step 2: Convert to fraction form
   12,665.74/18,996.96 = 3,900.46/x
3. Step 3: Cross multiply
   12,665.74x = 18,996.96 × 3,900.46
4. Step 4: Simplify right side
   12,665.74x = 74,096,882.60
5. Step 5: Solve for x
   x = 74,096,882.60/12,665.74
6. Step 6: Final answer
   x = 5,850.18