Finding the Fourth Proportional to 1,172.69, 1,618.32 and 648.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.69 : 1,618.32 = 648.73 : x
2. Step 2: Convert to fraction form
   1,172.69/1,618.32 = 648.73/x
3. Step 3: Cross multiply
   1,172.69x = 1,618.32 × 648.73
4. Step 4: Simplify right side
   1,172.69x = 1,049,852.73
5. Step 5: Solve for x
   x = 1,049,852.73/1,172.69
6. Step 6: Final answer
   x = 895.25