Finding the Fourth Proportional to 12,019.36, 18,031.92 and 4,997.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,019.36 : 18,031.92 = 4,997.20 : x
2. Step 2: Convert to fraction form
   12,019.36/18,031.92 = 4,997.20/x
3. Step 3: Cross multiply
   12,019.36x = 18,031.92 × 4,997.20
4. Step 4: Simplify right side
   12,019.36x = 90,109,110.62
5. Step 5: Solve for x
   x = 90,109,110.62/12,019.36
6. Step 6: Final answer
   x = 7,497.00