Finding the Fourth Proportional to 7,909.67, 10,920.42 and 5,078.25

Step by Step Solution

1. Step 1: Write the proportion equation
   7,909.67 : 10,920.42 = 5,078.25 : x
2. Step 2: Convert to fraction form
   7,909.67/10,920.42 = 5,078.25/x
3. Step 3: Cross multiply
   7,909.67x = 10,920.42 × 5,078.25
4. Step 4: Simplify right side
   7,909.67x = 55,456,622.87
5. Step 5: Solve for x
   x = 55,456,622.87/7,909.67
6. Step 6: Final answer
   x = 7,011.25