Finding the Fourth Proportional to 21,823.40, 30,116.33 and 12,391.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,823.40 : 30,116.33 = 12,391.96 : x
2. Step 2: Convert to fraction form
   21,823.40/30,116.33 = 12,391.96/x
3. Step 3: Cross multiply
   21,823.40x = 30,116.33 × 12,391.96
4. Step 4: Simplify right side
   21,823.40x = 373,200,356.71
5. Step 5: Solve for x
   x = 373,200,356.71/21,823.40
6. Step 6: Final answer
   x = 17,100.93