Finding the Fourth Proportional to 2,614.91, 3,922.17 and 859.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,614.91 : 3,922.17 = 859.98 : x
2. Step 2: Convert to fraction form
   2,614.91/3,922.17 = 859.98/x
3. Step 3: Cross multiply
   2,614.91x = 3,922.17 × 859.98
4. Step 4: Simplify right side
   2,614.91x = 3,372,970.98
5. Step 5: Solve for x
   x = 3,372,970.98/2,614.91
6. Step 6: Final answer
   x = 1,289.90