Finding the Fourth Proportional to 21,917.98, 30,244.35 and 12,842.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,917.98 : 30,244.35 = 12,842.74 : x
2. Step 2: Convert to fraction form
   21,917.98/30,244.35 = 12,842.74/x
3. Step 3: Cross multiply
   21,917.98x = 30,244.35 × 12,842.74
4. Step 4: Simplify right side
   21,917.98x = 388,420,323.52
5. Step 5: Solve for x
   x = 388,420,323.52/21,917.98
6. Step 6: Final answer
   x = 17,721.54