Finding the Fourth Proportional to 1,961.72, 2,943.34 and 865.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,961.72 : 2,943.34 = 865.31 : x
2. Step 2: Convert to fraction form
   1,961.72/2,943.34 = 865.31/x
3. Step 3: Cross multiply
   1,961.72x = 2,943.34 × 865.31
4. Step 4: Simplify right side
   1,961.72x = 2,546,899.37
5. Step 5: Solve for x
   x = 2,546,899.37/1,961.72
6. Step 6: Final answer
   x = 1,298.30