Finding the Fourth Proportional to 5,280.10, 7,912.86 and 5,122.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.10 : 7,912.86 = 5,122.42 : x
2. Step 2: Convert to fraction form
   5,280.10/7,912.86 = 5,122.42/x
3. Step 3: Cross multiply
   5,280.10x = 7,912.86 × 5,122.42
4. Step 4: Simplify right side
   5,280.10x = 40,532,992.32
5. Step 5: Solve for x
   x = 40,532,992.32/5,280.10
6. Step 6: Final answer
   x = 7,676.56