Finding the Fourth Proportional to 12,399.62, 17,110.86 and 7,021.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399.62 : 17,110.86 = 7,021.22 : x
2. Step 2: Convert to fraction form
   12,399.62/17,110.86 = 7,021.22/x
3. Step 3: Cross multiply
   12,399.62x = 17,110.86 × 7,021.22
4. Step 4: Simplify right side
   12,399.62x = 120,139,112.45
5. Step 5: Solve for x
   x = 120,139,112.45/12,399.62
6. Step 6: Final answer
   x = 9,688.94