Finding the Fourth Proportional to 1,419.78, 1,958.85 and 860.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.78 : 1,958.85 = 860.07 : x
2. Step 2: Convert to fraction form
   1,419.78/1,958.85 = 860.07/x
3. Step 3: Cross multiply
   1,419.78x = 1,958.85 × 860.07
4. Step 4: Simplify right side
   1,419.78x = 1,684,748.12
5. Step 5: Solve for x
   x = 1,684,748.12/1,419.78
6. Step 6: Final answer
   x = 1,186.63