Finding the Fourth Proportional to 6,649.78, 9,953.61 and 3,719.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,649.78 : 9,953.61 = 3,719.20 : x
2. Step 2: Convert to fraction form
   6,649.78/9,953.61 = 3,719.20/x
3. Step 3: Cross multiply
   6,649.78x = 9,953.61 × 3,719.20
4. Step 4: Simplify right side
   6,649.78x = 37,019,466.31
5. Step 5: Solve for x
   x = 37,019,466.31/6,649.78
6. Step 6: Final answer
   x = 5,567.02