Finding the Fourth Proportional to 15,659.04, 21,609.47 and 8,585.31

Step by Step Solution

1. Step 1: Write the proportion equation
   15,659.04 : 21,609.47 = 8,585.31 : x
2. Step 2: Convert to fraction form
   15,659.04/21,609.47 = 8,585.31/x
3. Step 3: Cross multiply
   15,659.04x = 21,609.47 × 8,585.31
4. Step 4: Simplify right side
   15,659.04x = 185,523,998.89
5. Step 5: Solve for x
   x = 185,523,998.89/15,659.04
6. Step 6: Final answer
   x = 11,847.72