Finding the Fourth Proportional to 12,665.60, 18,997.94 and 3,900.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.60 : 18,997.94 = 3,900.29 : x
2. Step 2: Convert to fraction form
   12,665.60/18,997.94 = 3,900.29/x
3. Step 3: Cross multiply
   12,665.60x = 18,997.94 × 3,900.29
4. Step 4: Simplify right side
   12,665.60x = 74,097,360.91
5. Step 5: Solve for x
   x = 74,097,360.91/12,665.60
6. Step 6: Final answer
   x = 5,850.29