Finding the Fourth Proportional to 22,448.51, 30,978.77 and 12,239.51

Step by Step Solution

1. Step 1: Write the proportion equation
   22,448.51 : 30,978.77 = 12,239.51 : x
2. Step 2: Convert to fraction form
   22,448.51/30,978.77 = 12,239.51/x
3. Step 3: Cross multiply
   22,448.51x = 30,978.77 × 12,239.51
4. Step 4: Simplify right side
   22,448.51x = 379,164,749.11
5. Step 5: Solve for x
   x = 379,164,749.11/22,448.51
6. Step 6: Final answer
   x = 16,890.42