Finding the Fourth Proportional to 12,389.70, 18,587.43 and 3,624.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,389.70 : 18,587.43 = 3,624.78 : x
2. Step 2: Convert to fraction form
   12,389.70/18,587.43 = 3,624.78/x
3. Step 3: Cross multiply
   12,389.70x = 18,587.43 × 3,624.78
4. Step 4: Simplify right side
   12,389.70x = 67,375,344.52
5. Step 5: Solve for x
   x = 67,375,344.52/12,389.70
6. Step 6: Final answer
   x = 5,438.01