Finding the Fourth Proportional to 22,393.89, 30,908.03 and 12,840.21

Step by Step Solution

1. Step 1: Write the proportion equation
   22,393.89 : 30,908.03 = 12,840.21 : x
2. Step 2: Convert to fraction form
   22,393.89/30,908.03 = 12,840.21/x
3. Step 3: Cross multiply
   22,393.89x = 30,908.03 × 12,840.21
4. Step 4: Simplify right side
   22,393.89x = 396,865,531.69
5. Step 5: Solve for x
   x = 396,865,531.69/22,393.89
6. Step 6: Final answer
   x = 17,722.05