Finding the Fourth Proportional to 2,419.91, 3,629.88 and 859.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,419.91 : 3,629.88 = 859.94 : x
2. Step 2: Convert to fraction form
   2,419.91/3,629.88 = 859.94/x
3. Step 3: Cross multiply
   2,419.91x = 3,629.88 × 859.94
4. Step 4: Simplify right side
   2,419.91x = 3,121,460.86
5. Step 5: Solve for x
   x = 3,121,460.86/2,419.91
6. Step 6: Final answer
   x = 1,289.91