Finding the Fourth Proportional to 6,978.22, 9,629.38 and 3,993.37

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.22 : 9,629.38 = 3,993.37 : x
2. Step 2: Convert to fraction form
   6,978.22/9,629.38 = 3,993.37/x
3. Step 3: Cross multiply
   6,978.22x = 9,629.38 × 3,993.37
4. Step 4: Simplify right side
   6,978.22x = 38,453,677.21
5. Step 5: Solve for x
   x = 38,453,677.21/6,978.22
6. Step 6: Final answer
   x = 5,510.53