Finding the Fourth Proportional to 12,399.54, 18,599.46 and 3,634.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.54 : 18,599.46 = 3,634.63 : x
2. Step 2: Convert to fraction form
   12,399.54/18,599.46 = 3,634.63/x
3. Step 3: Cross multiply
   12,399.54x = 18,599.46 × 3,634.63
4. Step 4: Simplify right side
   12,399.54x = 67,602,155.30
5. Step 5: Solve for x
   x = 67,602,155.30/12,399.54
6. Step 6: Final answer
   x = 5,451.99