Finding the Fourth Proportional to 9,687.78, 14,530.86 and 3,112.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,687.78 : 14,530.86 = 3,112.20 : x
2. Step 2: Convert to fraction form
   9,687.78/14,530.86 = 3,112.20/x
3. Step 3: Cross multiply
   9,687.78x = 14,530.86 × 3,112.20
4. Step 4: Simplify right side
   9,687.78x = 45,222,942.49
5. Step 5: Solve for x
   x = 45,222,942.49/9,687.78
6. Step 6: Final answer
   x = 4,668.04