Finding the Fourth Proportional to 21,753.84, 30,015.99 and 12,801.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,753.84 : 30,015.99 = 12,801.72 : x
2. Step 2: Convert to fraction form
   21,753.84/30,015.99 = 12,801.72/x
3. Step 3: Cross multiply
   21,753.84x = 30,015.99 × 12,801.72
4. Step 4: Simplify right side
   21,753.84x = 384,256,299.50
5. Step 5: Solve for x
   x = 384,256,299.50/21,753.84
6. Step 6: Final answer
   x = 17,663.84