Finding the Fourth Proportional to 1,171.98, 1,617.37 and 648.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.98 : 1,617.37 = 648.05 : x
2. Step 2: Convert to fraction form
   1,171.98/1,617.37 = 648.05/x
3. Step 3: Cross multiply
   1,171.98x = 1,617.37 × 648.05
4. Step 4: Simplify right side
   1,171.98x = 1,048,126.92
5. Step 5: Solve for x
   x = 1,048,126.92/1,171.98
6. Step 6: Final answer
   x = 894.32