Finding the Fourth Proportional to 1,171.55, 1,616.72 and 647.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.55 : 1,616.72 = 647.57 : x
2. Step 2: Convert to fraction form
   1,171.55/1,616.72 = 647.57/x
3. Step 3: Cross multiply
   1,171.55x = 1,616.72 × 647.57
4. Step 4: Simplify right side
   1,171.55x = 1,046,928.05
5. Step 5: Solve for x
   x = 1,046,928.05/1,171.55
6. Step 6: Final answer
   x = 893.63