Finding the Fourth Proportional to 1,406.85, 1,939.39 and 985.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.85 : 1,939.39 = 985.87 : x
2. Step 2: Convert to fraction form
   1,406.85/1,939.39 = 985.87/x
3. Step 3: Cross multiply
   1,406.85x = 1,939.39 × 985.87
4. Step 4: Simplify right side
   1,406.85x = 1,911,986.42
5. Step 5: Solve for x
   x = 1,911,986.42/1,406.85
6. Step 6: Final answer
   x = 1,359.05