Finding the Fourth Proportional to 1,371.27, 1,891.46 and 839.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.27 : 1,891.46 = 839.86 : x
2. Step 2: Convert to fraction form
   1,371.27/1,891.46 = 839.86/x
3. Step 3: Cross multiply
   1,371.27x = 1,891.46 × 839.86
4. Step 4: Simplify right side
   1,371.27x = 1,588,561.60
5. Step 5: Solve for x
   x = 1,588,561.60/1,371.27
6. Step 6: Final answer
   x = 1,158.46