Finding the Fourth Proportional to 15,300.72, 21,115.80 and 8,586

Step by Step Solution

1. Step 1: Write the proportion equation
   15,300.72 : 21,115.80 = 8,586 : x
2. Step 2: Convert to fraction form
   15,300.72/21,115.80 = 8,586/x
3. Step 3: Cross multiply
   15,300.72x = 21,115.80 × 8,586
4. Step 4: Simplify right side
   15,300.72x = 181,300,258.80
5. Step 5: Solve for x
   x = 181,300,258.80/15,300.72
6. Step 6: Final answer
   x = 11,849.13