Finding the Fourth Proportional to 1,172.34, 1,617.84 and 648.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.34 : 1,617.84 = 648.42 : x
2. Step 2: Convert to fraction form
   1,172.34/1,617.84 = 648.42/x
3. Step 3: Cross multiply
   1,172.34x = 1,617.84 × 648.42
4. Step 4: Simplify right side
   1,172.34x = 1,049,039.81
5. Step 5: Solve for x
   x = 1,049,039.81/1,172.34
6. Step 6: Final answer
   x = 894.83