Finding the Fourth Proportional to 12,436.87, 18,658.71 and 3,671.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,436.87 : 18,658.71 = 3,671.78 : x
2. Step 2: Convert to fraction form
   12,436.87/18,658.71 = 3,671.78/x
3. Step 3: Cross multiply
   12,436.87x = 18,658.71 × 3,671.78
4. Step 4: Simplify right side
   12,436.87x = 68,510,678.20
5. Step 5: Solve for x
   x = 68,510,678.20/12,436.87
6. Step 6: Final answer
   x = 5,508.68