Finding the Fourth Proportional to 9,249.31, 12,764.28 and 5,057.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,249.31 : 12,764.28 = 5,057.87 : x
2. Step 2: Convert to fraction form
   9,249.31/12,764.28 = 5,057.87/x
3. Step 3: Cross multiply
   9,249.31x = 12,764.28 × 5,057.87
4. Step 4: Simplify right side
   9,249.31x = 64,560,043.59
5. Step 5: Solve for x
   x = 64,560,043.59/9,249.31
6. Step 6: Final answer
   x = 6,979.98