Finding the Fourth Proportional to 3,970.89, 5,479.89 and 2,398.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,970.89 : 5,479.89 = 2,398.68 : x
2. Step 2: Convert to fraction form
   3,970.89/5,479.89 = 2,398.68/x
3. Step 3: Cross multiply
   3,970.89x = 5,479.89 × 2,398.68
4. Step 4: Simplify right side
   3,970.89x = 13,144,502.55
5. Step 5: Solve for x
   x = 13,144,502.55/3,970.89
6. Step 6: Final answer
   x = 3,310.22