Finding the Fourth Proportional to 7,003.78, 9,664.86 and 3,859.36

Step by Step Solution

1. Step 1: Write the proportion equation
   7,003.78 : 9,664.86 = 3,859.36 : x
2. Step 2: Convert to fraction form
   7,003.78/9,664.86 = 3,859.36/x
3. Step 3: Cross multiply
   7,003.78x = 9,664.86 × 3,859.36
4. Step 4: Simplify right side
   7,003.78x = 37,300,174.09
5. Step 5: Solve for x
   x = 37,300,174.09/7,003.78
6. Step 6: Final answer
   x = 5,325.72