Finding the Fourth Proportional to 8,947.31, 12,338.64 and 5,757.35

Step by Step Solution

1. Step 1: Write the proportion equation
   8,947.31 : 12,338.64 = 5,757.35 : x
2. Step 2: Convert to fraction form
   8,947.31/12,338.64 = 5,757.35/x
3. Step 3: Cross multiply
   8,947.31x = 12,338.64 × 5,757.35
4. Step 4: Simplify right side
   8,947.31x = 71,037,807.31
5. Step 5: Solve for x
   x = 71,037,807.31/8,947.31
6. Step 6: Final answer
   x = 7,939.58