Finding the Fourth Proportional to 8,768.10, 12,099.96 and 5,231.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,768.10 : 12,099.96 = 5,231.31 : x
2. Step 2: Convert to fraction form
   8,768.10/12,099.96 = 5,231.31/x
3. Step 3: Cross multiply
   8,768.10x = 12,099.96 × 5,231.31
4. Step 4: Simplify right side
   8,768.10x = 63,298,641.75
5. Step 5: Solve for x
   x = 63,298,641.75/8,768.10
6. Step 6: Final answer
   x = 7,219.20