Finding the Fourth Proportional to 1,419.66, 1,959.14 and 859.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.66 : 1,959.14 = 859.99 : x
2. Step 2: Convert to fraction form
   1,419.66/1,959.14 = 859.99/x
3. Step 3: Cross multiply
   1,419.66x = 1,959.14 × 859.99
4. Step 4: Simplify right side
   1,419.66x = 1,684,840.81
5. Step 5: Solve for x
   x = 1,684,840.81/1,419.66
6. Step 6: Final answer
   x = 1,186.79