Finding the Fourth Proportional to 3,889.72, 5,367.63 and 2,397.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,889.72 : 5,367.63 = 2,397.78 : x
2. Step 2: Convert to fraction form
   3,889.72/5,367.63 = 2,397.78/x
3. Step 3: Cross multiply
   3,889.72x = 5,367.63 × 2,397.78
4. Step 4: Simplify right side
   3,889.72x = 12,870,404.85
5. Step 5: Solve for x
   x = 12,870,404.85/3,889.72
6. Step 6: Final answer
   x = 3,308.82