Finding the Fourth Proportional to 15,839.21, 21,855.83 and 8,765.62

Step by Step Solution

1. Step 1: Write the proportion equation
   15,839.21 : 21,855.83 = 8,765.62 : x
2. Step 2: Convert to fraction form
   15,839.21/21,855.83 = 8,765.62/x
3. Step 3: Cross multiply
   15,839.21x = 21,855.83 × 8,765.62
4. Step 4: Simplify right side
   15,839.21x = 191,579,802.10
5. Step 5: Solve for x
   x = 191,579,802.10/15,839.21
6. Step 6: Final answer
   x = 12,095.29