Finding the Fourth Proportional to 12,019.39, 18,029.72 and 3,705.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.39 : 18,029.72 = 3,705.12 : x
2. Step 2: Convert to fraction form
   12,019.39/18,029.72 = 3,705.12/x
3. Step 3: Cross multiply
   12,019.39x = 18,029.72 × 3,705.12
4. Step 4: Simplify right side
   12,019.39x = 66,802,285.43
5. Step 5: Solve for x
   x = 66,802,285.43/12,019.39
6. Step 6: Final answer
   x = 5,557.88