Finding the Fourth Proportional to 1,515.71, 2,091.61 and 843.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,515.71 : 2,091.61 = 843.55 : x
2. Step 2: Convert to fraction form
   1,515.71/2,091.61 = 843.55/x
3. Step 3: Cross multiply
   1,515.71x = 2,091.61 × 843.55
4. Step 4: Simplify right side
   1,515.71x = 1,764,377.62
5. Step 5: Solve for x
   x = 1,764,377.62/1,515.71
6. Step 6: Final answer
   x = 1,164.06