Finding the Fourth Proportional to 9,404.93, 12,978.26 and 5,372.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.93 : 12,978.26 = 5,372.20 : x
2. Step 2: Convert to fraction form
   9,404.93/12,978.26 = 5,372.20/x
3. Step 3: Cross multiply
   9,404.93x = 12,978.26 × 5,372.20
4. Step 4: Simplify right side
   9,404.93x = 69,721,716.62
5. Step 5: Solve for x
   x = 69,721,716.62/9,404.93
6. Step 6: Final answer
   x = 7,413.32