Finding the Fourth Proportional to 21,663, 29,899.56 and 14,866.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,663 : 29,899.56 = 14,866.32 : x
2. Step 2: Convert to fraction form
   21,663/29,899.56 = 14,866.32/x
3. Step 3: Cross multiply
   21,663x = 29,899.56 × 14,866.32
4. Step 4: Simplify right side
   21,663x = 444,496,426.82
5. Step 5: Solve for x
   x = 444,496,426.82/21,663
6. Step 6: Final answer
   x = 20,518.69