Finding the Fourth Proportional to 21,920.67, 30,260.59 and 12,844.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,920.67 : 30,260.59 = 12,844.77 : x
2. Step 2: Convert to fraction form
   21,920.67/30,260.59 = 12,844.77/x
3. Step 3: Cross multiply
   21,920.67x = 30,260.59 × 12,844.77
4. Step 4: Simplify right side
   21,920.67x = 388,690,173.03
5. Step 5: Solve for x
   x = 388,690,173.03/21,920.67
6. Step 6: Final answer
   x = 17,731.67