Finding the Fourth Proportional to 3,389.86, 4,679.79 and 2,196.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,389.86 : 4,679.79 = 2,196.55 : x
2. Step 2: Convert to fraction form
   3,389.86/4,679.79 = 2,196.55/x
3. Step 3: Cross multiply
   3,389.86x = 4,679.79 × 2,196.55
4. Step 4: Simplify right side
   3,389.86x = 10,279,369.33
5. Step 5: Solve for x
   x = 10,279,369.33/3,389.86
6. Step 6: Final answer
   x = 3,032.39