Finding the Fourth Proportional to 15,849.63, 21,872.48 and 8,776.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,849.63 : 21,872.48 = 8,776.50 : x
2. Step 2: Convert to fraction form
   15,849.63/21,872.48 = 8,776.50/x
3. Step 3: Cross multiply
   15,849.63x = 21,872.48 × 8,776.50
4. Step 4: Simplify right side
   15,849.63x = 191,963,820.72
5. Step 5: Solve for x
   x = 191,963,820.72/15,849.63
6. Step 6: Final answer
   x = 12,111.56