Finding the Fourth Proportional to 1,172.63, 1,618.23 and 648.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.63 : 1,618.23 = 648.69 : x
2. Step 2: Convert to fraction form
   1,172.63/1,618.23 = 648.69/x
3. Step 3: Cross multiply
   1,172.63x = 1,618.23 × 648.69
4. Step 4: Simplify right side
   1,172.63x = 1,049,729.62
5. Step 5: Solve for x
   x = 1,049,729.62/1,172.63
6. Step 6: Final answer
   x = 895.20