Finding the Fourth Proportional to 1,216.86, 1,680.03 and 843.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.86 : 1,680.03 = 843.71 : x
2. Step 2: Convert to fraction form
   1,216.86/1,680.03 = 843.71/x
3. Step 3: Cross multiply
   1,216.86x = 1,680.03 × 843.71
4. Step 4: Simplify right side
   1,216.86x = 1,417,449.71
5. Step 5: Solve for x
   x = 1,417,449.71/1,216.86
6. Step 6: Final answer
   x = 1,164.84