Finding the Fourth Proportional to 2,520.89, 3,478.94 and 1,401.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.89 : 3,478.94 = 1,401.78 : x
2. Step 2: Convert to fraction form
   2,520.89/3,478.94 = 1,401.78/x
3. Step 3: Cross multiply
   2,520.89x = 3,478.94 × 1,401.78
4. Step 4: Simplify right side
   2,520.89x = 4,876,708.51
5. Step 5: Solve for x
   x = 4,876,708.51/2,520.89
6. Step 6: Final answer
   x = 1,934.52