Finding the Fourth Proportional to 12,019.69, 18,029.79 and 3,699.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.69 : 18,029.79 = 3,699.78 : x
2. Step 2: Convert to fraction form
   12,019.69/18,029.79 = 3,699.78/x
3. Step 3: Cross multiply
   12,019.69x = 18,029.79 × 3,699.78
4. Step 4: Simplify right side
   12,019.69x = 66,706,188.83
5. Step 5: Solve for x
   x = 66,706,188.83/12,019.69
6. Step 6: Final answer
   x = 5,549.74