Finding the Fourth Proportional to 2,142.25, 3,213.33 and 843.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.25 : 3,213.33 = 843.72 : x
2. Step 2: Convert to fraction form
   2,142.25/3,213.33 = 843.72/x
3. Step 3: Cross multiply
   2,142.25x = 3,213.33 × 843.72
4. Step 4: Simplify right side
   2,142.25x = 2,711,141.51
5. Step 5: Solve for x
   x = 2,711,141.51/2,142.25
6. Step 6: Final answer
   x = 1,265.56