Finding the Fourth Proportional to 1,515.51, 2,091.39 and 843.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,515.51 : 2,091.39 = 843.31 : x
2. Step 2: Convert to fraction form
   1,515.51/2,091.39 = 843.31/x
3. Step 3: Cross multiply
   1,515.51x = 2,091.39 × 843.31
4. Step 4: Simplify right side
   1,515.51x = 1,763,689.55
5. Step 5: Solve for x
   x = 1,763,689.55/1,515.51
6. Step 6: Final answer
   x = 1,163.76