Finding the Fourth Proportional to 9,377.28, 12,939.54 and 5,185.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,377.28 : 12,939.54 = 5,185.56 : x
2. Step 2: Convert to fraction form
   9,377.28/12,939.54 = 5,185.56/x
3. Step 3: Cross multiply
   9,377.28x = 12,939.54 × 5,185.56
4. Step 4: Simplify right side
   9,377.28x = 67,098,761.04
5. Step 5: Solve for x
   x = 67,098,761.04/9,377.28
6. Step 6: Final answer
   x = 7,155.46