Finding the Fourth Proportional to 3,807.69, 5,719.79 and 3,223.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,807.69 : 5,719.79 = 3,223.89 : x
2. Step 2: Convert to fraction form
   3,807.69/5,719.79 = 3,223.89/x
3. Step 3: Cross multiply
   3,807.69x = 5,719.79 × 3,223.89
4. Step 4: Simplify right side
   3,807.69x = 18,439,973.78
5. Step 5: Solve for x
   x = 18,439,973.78/3,807.69
6. Step 6: Final answer
   x = 4,842.82