Finding the Fourth Proportional to 3,401.67, 5,100.62 and 1,320.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,401.67 : 5,100.62 = 1,320.38 : x
2. Step 2: Convert to fraction form
   3,401.67/5,100.62 = 1,320.38/x
3. Step 3: Cross multiply
   3,401.67x = 5,100.62 × 1,320.38
4. Step 4: Simplify right side
   3,401.67x = 6,734,756.64
5. Step 5: Solve for x
   x = 6,734,756.64/3,401.67
6. Step 6: Final answer
   x = 1,979.84