Finding the Fourth Proportional to 8,802.72, 12,139.20 and 5,817.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,802.72 : 12,139.20 = 5,817.60 : x
2. Step 2: Convert to fraction form
   8,802.72/12,139.20 = 5,817.60/x
3. Step 3: Cross multiply
   8,802.72x = 12,139.20 × 5,817.60
4. Step 4: Simplify right side
   8,802.72x = 70,621,009.92
5. Step 5: Solve for x
   x = 70,621,009.92/8,802.72
6. Step 6: Final answer
   x = 8,022.64