Finding the Fourth Proportional to 3,898.16, 5,379.43 and 2,196.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,898.16 : 5,379.43 = 2,196.51 : x
2. Step 2: Convert to fraction form
   3,898.16/5,379.43 = 2,196.51/x
3. Step 3: Cross multiply
   3,898.16x = 5,379.43 × 2,196.51
4. Step 4: Simplify right side
   3,898.16x = 11,815,971.79
5. Step 5: Solve for x
   x = 11,815,971.79/3,898.16
6. Step 6: Final answer
   x = 3,031.17