Finding the Fourth Proportional to 21,811.98, 30,111.72 and 12,862.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,811.98 : 30,111.72 = 12,862.38 : x
2. Step 2: Convert to fraction form
   21,811.98/30,111.72 = 12,862.38/x
3. Step 3: Cross multiply
   21,811.98x = 30,111.72 × 12,862.38
4. Step 4: Simplify right side
   21,811.98x = 387,308,385.09
5. Step 5: Solve for x
   x = 387,308,385.09/21,811.98
6. Step 6: Final answer
   x = 17,756.68