Finding the Fourth Proportional to 3,665.69, 5,499.09 and 1,199.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.69 : 5,499.09 = 1,199.69 : x
2. Step 2: Convert to fraction form
   3,665.69/5,499.09 = 1,199.69/x
3. Step 3: Cross multiply
   3,665.69x = 5,499.09 × 1,199.69
4. Step 4: Simplify right side
   3,665.69x = 6,597,175.79
5. Step 5: Solve for x
   x = 6,597,175.79/3,665.69
6. Step 6: Final answer
   x = 1,799.71