Finding the Fourth Proportional to 8,483.20, 12,662.83 and 7,857.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,483.20 : 12,662.83 = 7,857.88 : x
2. Step 2: Convert to fraction form
   8,483.20/12,662.83 = 7,857.88/x
3. Step 3: Cross multiply
   8,483.20x = 12,662.83 × 7,857.88
4. Step 4: Simplify right side
   8,483.20x = 99,502,998.60
5. Step 5: Solve for x
   x = 99,502,998.60/8,483.20
6. Step 6: Final answer
   x = 11,729.42