Finding the Fourth Proportional to 12,019.78, 18,031.37 and 3,700.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.78 : 18,031.37 = 3,700.49 : x
2. Step 2: Convert to fraction form
   12,019.78/18,031.37 = 3,700.49/x
3. Step 3: Cross multiply
   12,019.78x = 18,031.37 × 3,700.49
4. Step 4: Simplify right side
   12,019.78x = 66,724,823.47
5. Step 5: Solve for x
   x = 66,724,823.47/12,019.78
6. Step 6: Final answer
   x = 5,551.25