Finding the Fourth Proportional to 12,459.78, 18,689.63 and 3,694.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,459.78 : 18,689.63 = 3,694.01 : x
2. Step 2: Convert to fraction form
   12,459.78/18,689.63 = 3,694.01/x
3. Step 3: Cross multiply
   12,459.78x = 18,689.63 × 3,694.01
4. Step 4: Simplify right side
   12,459.78x = 69,039,568.20
5. Step 5: Solve for x
   x = 69,039,568.20/12,459.78
6. Step 6: Final answer
   x = 5,540.99