Finding the Fourth Proportional to 8,608.72, 12,905.52 and 5,680.84

Step by Step Solution

1. Step 1: Write the proportion equation
   8,608.72 : 12,905.52 = 5,680.84 : x
2. Step 2: Convert to fraction form
   8,608.72/12,905.52 = 5,680.84/x
3. Step 3: Cross multiply
   8,608.72x = 12,905.52 × 5,680.84
4. Step 4: Simplify right side
   8,608.72x = 73,314,194.24
5. Step 5: Solve for x
   x = 73,314,194.24/8,608.72
6. Step 6: Final answer
   x = 8,516.27