Finding the Fourth Proportional to 1,392.86, 2,085.12 and 843.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.86 : 2,085.12 = 843.36 : x
2. Step 2: Convert to fraction form
   1,392.86/2,085.12 = 843.36/x
3. Step 3: Cross multiply
   1,392.86x = 2,085.12 × 843.36
4. Step 4: Simplify right side
   1,392.86x = 1,758,506.80
5. Step 5: Solve for x
   x = 1,758,506.80/1,392.86
6. Step 6: Final answer
   x = 1,262.52