Finding the Fourth Proportional to 3,401.80, 5,101.38 and 1,321.53

Step by Step Solution

1. Step 1: Write the proportion equation
   3,401.80 : 5,101.38 = 1,321.53 : x
2. Step 2: Convert to fraction form
   3,401.80/5,101.38 = 1,321.53/x
3. Step 3: Cross multiply
   3,401.80x = 5,101.38 × 1,321.53
4. Step 4: Simplify right side
   3,401.80x = 6,741,609.23
5. Step 5: Solve for x
   x = 6,741,609.23/3,401.80
6. Step 6: Final answer
   x = 1,981.78