Finding the Fourth Proportional to 7,280.88, 10,912.20 and 3,115.98

Step by Step Solution

1. Step 1: Write the proportion equation
   7,280.88 : 10,912.20 = 3,115.98 : x
2. Step 2: Convert to fraction form
   7,280.88/10,912.20 = 3,115.98/x
3. Step 3: Cross multiply
   7,280.88x = 10,912.20 × 3,115.98
4. Step 4: Simplify right side
   7,280.88x = 34,002,196.96
5. Step 5: Solve for x
   x = 34,002,196.96/7,280.88
6. Step 6: Final answer
   x = 4,670.07