Finding the Fourth Proportional to 1,419.86, 1,959.58 and 860.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.86 : 1,959.58 = 860.31 : x
2. Step 2: Convert to fraction form
   1,419.86/1,959.58 = 860.31/x
3. Step 3: Cross multiply
   1,419.86x = 1,959.58 × 860.31
4. Step 4: Simplify right side
   1,419.86x = 1,685,846.27
5. Step 5: Solve for x
   x = 1,685,846.27/1,419.86
6. Step 6: Final answer
   x = 1,187.33