Finding the Fourth Proportional to 8,817.20, 12,165.72 and 5,039.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,817.20 : 12,165.72 = 5,039.72 : x
2. Step 2: Convert to fraction form
   8,817.20/12,165.72 = 5,039.72/x
3. Step 3: Cross multiply
   8,817.20x = 12,165.72 × 5,039.72
4. Step 4: Simplify right side
   8,817.20x = 61,311,822.40
5. Step 5: Solve for x
   x = 61,311,822.40/8,817.20
6. Step 6: Final answer
   x = 6,953.66