Finding the Fourth Proportional to 1,171.39, 1,616.60 and 647.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.39 : 1,616.60 = 647.41 : x
2. Step 2: Convert to fraction form
   1,171.39/1,616.60 = 647.41/x
3. Step 3: Cross multiply
   1,171.39x = 1,616.60 × 647.41
4. Step 4: Simplify right side
   1,171.39x = 1,046,591.69
5. Step 5: Solve for x
   x = 1,046,591.69/1,171.39
6. Step 6: Final answer
   x = 893.47