Finding the Fourth Proportional to 3,968.15, 5,475.78 and 2,199.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,968.15 : 5,475.78 = 2,199.69 : x
2. Step 2: Convert to fraction form
   3,968.15/5,475.78 = 2,199.69/x
3. Step 3: Cross multiply
   3,968.15x = 5,475.78 × 2,199.69
4. Step 4: Simplify right side
   3,968.15x = 12,045,018.51
5. Step 5: Solve for x
   x = 12,045,018.51/3,968.15
6. Step 6: Final answer
   x = 3,035.43