Finding the Fourth Proportional to 3,778.98, 5,215.95 and 2,520.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,778.98 : 5,215.95 = 2,520.42 : x
2. Step 2: Convert to fraction form
   3,778.98/5,215.95 = 2,520.42/x
3. Step 3: Cross multiply
   3,778.98x = 5,215.95 × 2,520.42
4. Step 4: Simplify right side
   3,778.98x = 13,146,384.70
5. Step 5: Solve for x
   x = 13,146,384.70/3,778.98
6. Step 6: Final answer
   x = 3,478.82