Finding the Fourth Proportional to 2,419.51, 3,628.59 and 859.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,419.51 : 3,628.59 = 859.30 : x
2. Step 2: Convert to fraction form
   2,419.51/3,628.59 = 859.30/x
3. Step 3: Cross multiply
   2,419.51x = 3,628.59 × 859.30
4. Step 4: Simplify right side
   2,419.51x = 3,118,047.39
5. Step 5: Solve for x
   x = 3,118,047.39/2,419.51
6. Step 6: Final answer
   x = 1,288.71