Finding the Fourth Proportional to 1,015.71, 1,399.59 and 836.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.71 : 1,399.59 = 836.70 : x
2. Step 2: Convert to fraction form
   1,015.71/1,399.59 = 836.70/x
3. Step 3: Cross multiply
   1,015.71x = 1,399.59 × 836.70
4. Step 4: Simplify right side
   1,015.71x = 1,171,036.95
5. Step 5: Solve for x
   x = 1,171,036.95/1,015.71
6. Step 6: Final answer
   x = 1,152.92