Finding the Fourth Proportional to 1,171.38, 1,616.34 and 647.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.38 : 1,616.34 = 647.31 : x
2. Step 2: Convert to fraction form
   1,171.38/1,616.34 = 647.31/x
3. Step 3: Cross multiply
   1,171.38x = 1,616.34 × 647.31
4. Step 4: Simplify right side
   1,171.38x = 1,046,273.05
5. Step 5: Solve for x
   x = 1,046,273.05/1,171.38
6. Step 6: Final answer
   x = 893.20