Finding the Fourth Proportional to 8,768.87, 12,099.71 and 4,992.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,768.87 : 12,099.71 = 4,992.20 : x
2. Step 2: Convert to fraction form
   8,768.87/12,099.71 = 4,992.20/x
3. Step 3: Cross multiply
   8,768.87x = 12,099.71 × 4,992.20
4. Step 4: Simplify right side
   8,768.87x = 60,404,086.80
5. Step 5: Solve for x
   x = 60,404,086.80/8,768.87
6. Step 6: Final answer
   x = 6,888.47