Finding the Fourth Proportional to 22,395.30, 30,899.79 and 12,958.26

Step by Step Solution

1. Step 1: Write the proportion equation
   22,395.30 : 30,899.79 = 12,958.26 : x
2. Step 2: Convert to fraction form
   22,395.30/30,899.79 = 12,958.26/x
3. Step 3: Cross multiply
   22,395.30x = 30,899.79 × 12,958.26
4. Step 4: Simplify right side
   22,395.30x = 400,407,512.77
5. Step 5: Solve for x
   x = 400,407,512.77/22,395.30
6. Step 6: Final answer
   x = 17,879.09