Finding the Fourth Proportional to 3,897.90, 5,378.76 and 2,196.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,897.90 : 5,378.76 = 2,196.56 : x
2. Step 2: Convert to fraction form
   3,897.90/5,378.76 = 2,196.56/x
3. Step 3: Cross multiply
   3,897.90x = 5,378.76 × 2,196.56
4. Step 4: Simplify right side
   3,897.90x = 11,814,782.51
5. Step 5: Solve for x
   x = 11,814,782.51/3,897.90
6. Step 6: Final answer
   x = 3,031.06