Finding the Fourth Proportional to 1,419.49, 1,958.97 and 860.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.49 : 1,958.97 = 860.05 : x
2. Step 2: Convert to fraction form
   1,419.49/1,958.97 = 860.05/x
3. Step 3: Cross multiply
   1,419.49x = 1,958.97 × 860.05
4. Step 4: Simplify right side
   1,419.49x = 1,684,812.15
5. Step 5: Solve for x
   x = 1,684,812.15/1,419.49
6. Step 6: Final answer
   x = 1,186.91