Finding the Fourth Proportional to 1,336.81, 1,843.92 and 857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.81 : 1,843.92 = 857.50 : x
2. Step 2: Convert to fraction form
   1,336.81/1,843.92 = 857.50/x
3. Step 3: Cross multiply
   1,336.81x = 1,843.92 × 857.50
4. Step 4: Simplify right side
   1,336.81x = 1,581,166.25
5. Step 5: Solve for x
   x = 1,581,166.25/1,336.81
6. Step 6: Final answer
   x = 1,182.79