Finding the Fourth Proportional to 7,278.72, 10,910.25 and 3,120.54

Step by Step Solution

1. Step 1: Write the proportion equation
   7,278.72 : 10,910.25 = 3,120.54 : x
2. Step 2: Convert to fraction form
   7,278.72/10,910.25 = 3,120.54/x
3. Step 3: Cross multiply
   7,278.72x = 10,910.25 × 3,120.54
4. Step 4: Simplify right side
   7,278.72x = 34,045,871.54
5. Step 5: Solve for x
   x = 34,045,871.54/7,278.72
6. Step 6: Final answer
   x = 4,677.45