Finding the Fourth Proportional to 2,520.40, 3,478.13 and 1,401.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.40 : 3,478.13 = 1,401.31 : x
2. Step 2: Convert to fraction form
   2,520.40/3,478.13 = 1,401.31/x
3. Step 3: Cross multiply
   2,520.40x = 3,478.13 × 1,401.31
4. Step 4: Simplify right side
   2,520.40x = 4,873,938.35
5. Step 5: Solve for x
   x = 4,873,938.35/2,520.40
6. Step 6: Final answer
   x = 1,933.80