Finding the Fourth Proportional to 3,400.72, 5,099.49 and 1,321.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,400.72 : 5,099.49 = 1,321.69 : x
2. Step 2: Convert to fraction form
   3,400.72/5,099.49 = 1,321.69/x
3. Step 3: Cross multiply
   3,400.72x = 5,099.49 × 1,321.69
4. Step 4: Simplify right side
   3,400.72x = 6,739,944.94
5. Step 5: Solve for x
   x = 6,739,944.94/3,400.72
6. Step 6: Final answer
   x = 1,981.92