Finding the Fourth Proportional to 7,550.57, 10,420.98 and 7,218.38

Step by Step Solution

1. Step 1: Write the proportion equation
   7,550.57 : 10,420.98 = 7,218.38 : x
2. Step 2: Convert to fraction form
   7,550.57/10,420.98 = 7,218.38/x
3. Step 3: Cross multiply
   7,550.57x = 10,420.98 × 7,218.38
4. Step 4: Simplify right side
   7,550.57x = 75,222,593.61
5. Step 5: Solve for x
   x = 75,222,593.61/7,550.57
6. Step 6: Final answer
   x = 9,962.51