Finding the Fourth Proportional to 22,424.77, 30,939.33 and 12,991.51

Step by Step Solution

1. Step 1: Write the proportion equation
   22,424.77 : 30,939.33 = 12,991.51 : x
2. Step 2: Convert to fraction form
   22,424.77/30,939.33 = 12,991.51/x
3. Step 3: Cross multiply
   22,424.77x = 30,939.33 × 12,991.51
4. Step 4: Simplify right side
   22,424.77x = 401,948,615.09
5. Step 5: Solve for x
   x = 401,948,615.09/22,424.77
6. Step 6: Final answer
   x = 17,924.31