Finding the Fourth Proportional to 7,022.07, 9,690.57 and 3,878.28

Step by Step Solution

1. Step 1: Write the proportion equation
   7,022.07 : 9,690.57 = 3,878.28 : x
2. Step 2: Convert to fraction form
   7,022.07/9,690.57 = 3,878.28/x
3. Step 3: Cross multiply
   7,022.07x = 9,690.57 × 3,878.28
4. Step 4: Simplify right side
   7,022.07x = 37,582,743.82
5. Step 5: Solve for x
   x = 37,582,743.82/7,022.07
6. Step 6: Final answer
   x = 5,352.09