Finding the Fourth Proportional to 3,913.72, 5,401.95 and 2,420.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,913.72 : 5,401.95 = 2,420.77 : x
2. Step 2: Convert to fraction form
   3,913.72/5,401.95 = 2,420.77/x
3. Step 3: Cross multiply
   3,913.72x = 5,401.95 × 2,420.77
4. Step 4: Simplify right side
   3,913.72x = 13,076,886.47
5. Step 5: Solve for x
   x = 13,076,886.47/3,913.72
6. Step 6: Final answer
   x = 3,341.29