Finding the Fourth Proportional to 22,415.36, 30,939.04 and 12,982.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,415.36 : 30,939.04 = 12,982.72 : x
2. Step 2: Convert to fraction form
   22,415.36/30,939.04 = 12,982.72/x
3. Step 3: Cross multiply
   22,415.36x = 30,939.04 × 12,982.72
4. Step 4: Simplify right side
   22,415.36x = 401,672,893.39
5. Step 5: Solve for x
   x = 401,672,893.39/22,415.36
6. Step 6: Final answer
   x = 17,919.54