Finding the Fourth Proportional to 12,386.61, 18,581.58 and 3,621.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,386.61 : 18,581.58 = 3,621.42 : x
2. Step 2: Convert to fraction form
   12,386.61/18,581.58 = 3,621.42/x
3. Step 3: Cross multiply
   12,386.61x = 18,581.58 × 3,621.42
4. Step 4: Simplify right side
   12,386.61x = 67,291,705.44
5. Step 5: Solve for x
   x = 67,291,705.44/12,386.61
6. Step 6: Final answer
   x = 5,432.62