Finding the Fourth Proportional to 1,172.43, 1,617.98 and 648.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.43 : 1,617.98 = 648.47 : x
2. Step 2: Convert to fraction form
   1,172.43/1,617.98 = 648.47/x
3. Step 3: Cross multiply
   1,172.43x = 1,617.98 × 648.47
4. Step 4: Simplify right side
   1,172.43x = 1,049,212.29
5. Step 5: Solve for x
   x = 1,049,212.29/1,172.43
6. Step 6: Final answer
   x = 894.90