Finding the Fourth Proportional to 9,377.20, 12,939.12 and 5,185.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,377.20 : 12,939.12 = 5,185.48 : x
2. Step 2: Convert to fraction form
   9,377.20/12,939.12 = 5,185.48/x
3. Step 3: Cross multiply
   9,377.20x = 12,939.12 × 5,185.48
4. Step 4: Simplify right side
   9,377.20x = 67,095,547.98
5. Step 5: Solve for x
   x = 67,095,547.98/9,377.20
6. Step 6: Final answer
   x = 7,155.18