Finding the Fourth Proportional to 21,753.77, 30,019.61 and 12,801.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,753.77 : 30,019.61 = 12,801.80 : x
2. Step 2: Convert to fraction form
   21,753.77/30,019.61 = 12,801.80/x
3. Step 3: Cross multiply
   21,753.77x = 30,019.61 × 12,801.80
4. Step 4: Simplify right side
   21,753.77x = 384,304,981.49
5. Step 5: Solve for x
   x = 384,304,981.49/21,753.77
6. Step 6: Final answer
   x = 17,666.14