Finding the Fourth Proportional to 3,998.06, 5,518.78 and 2,426.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998.06 : 5,518.78 = 2,426.30 : x
2. Step 2: Convert to fraction form
   3,998.06/5,518.78 = 2,426.30/x
3. Step 3: Cross multiply
   3,998.06x = 5,518.78 × 2,426.30
4. Step 4: Simplify right side
   3,998.06x = 13,390,215.91
5. Step 5: Solve for x
   x = 13,390,215.91/3,998.06
6. Step 6: Final answer
   x = 3,349.18