Finding the Fourth Proportional to 1,419.99, 1,959.74 and 860.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.99 : 1,959.74 = 860.77 : x
2. Step 2: Convert to fraction form
   1,419.99/1,959.74 = 860.77/x
3. Step 3: Cross multiply
   1,419.99x = 1,959.74 × 860.77
4. Step 4: Simplify right side
   1,419.99x = 1,686,885.40
5. Step 5: Solve for x
   x = 1,686,885.40/1,419.99
6. Step 6: Final answer
   x = 1,187.96