Finding the Fourth Proportional to 3,917.34, 5,404.86 and 2,520.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,917.34 : 5,404.86 = 2,520.90 : x
2. Step 2: Convert to fraction form
   3,917.34/5,404.86 = 2,520.90/x
3. Step 3: Cross multiply
   3,917.34x = 5,404.86 × 2,520.90
4. Step 4: Simplify right side
   3,917.34x = 13,625,111.57
5. Step 5: Solve for x
   x = 13,625,111.57/3,917.34
6. Step 6: Final answer
   x = 3,478.15