Finding the Fourth Proportional to 3,913.70, 5,401.86 and 2,420.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.70 : 5,401.86 = 2,420.72 : x
2. Step 2: Convert to fraction form
   3,913.70/5,401.86 = 2,420.72/x
3. Step 3: Cross multiply
   3,913.70x = 5,401.86 × 2,420.72
4. Step 4: Simplify right side
   3,913.70x = 13,076,390.54
5. Step 5: Solve for x
   x = 13,076,390.54/3,913.70
6. Step 6: Final answer
   x = 3,341.18