Finding the Fourth Proportional to 15,709.59, 21,679.52 and 8,636.00

Step by Step Solution

1. Step 1: Write the proportion equation
   15,709.59 : 21,679.52 = 8,636.00 : x
2. Step 2: Convert to fraction form
   15,709.59/21,679.52 = 8,636.00/x
3. Step 3: Cross multiply
   15,709.59x = 21,679.52 × 8,636.00
4. Step 4: Simplify right side
   15,709.59x = 187,224,183.14
5. Step 5: Solve for x
   x = 187,224,183.14/15,709.59
6. Step 6: Final answer
   x = 11,917.83