Finding the Fourth Proportional to 1,433.18, 1,978.17 and 843.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.18 : 1,978.17 = 843.90 : x
2. Step 2: Convert to fraction form
   1,433.18/1,978.17 = 843.90/x
3. Step 3: Cross multiply
   1,433.18x = 1,978.17 × 843.90
4. Step 4: Simplify right side
   1,433.18x = 1,669,377.66
5. Step 5: Solve for x
   x = 1,669,377.66/1,433.18
6. Step 6: Final answer
   x = 1,164.81