Finding the Fourth Proportional to 3,917.56, 5,405.22 and 2,426.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,917.56 : 5,405.22 = 2,426.20 : x
2. Step 2: Convert to fraction form
   3,917.56/5,405.22 = 2,426.20/x
3. Step 3: Cross multiply
   3,917.56x = 5,405.22 × 2,426.20
4. Step 4: Simplify right side
   3,917.56x = 13,114,144.76
5. Step 5: Solve for x
   x = 13,114,144.76/3,917.56
6. Step 6: Final answer
   x = 3,347.53