Finding the Fourth Proportional to 1,172.80, 1,618.46 and 648.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.80 : 1,618.46 = 648.82 : x
2. Step 2: Convert to fraction form
   1,172.80/1,618.46 = 648.82/x
3. Step 3: Cross multiply
   1,172.80x = 1,618.46 × 648.82
4. Step 4: Simplify right side
   1,172.80x = 1,050,089.22
5. Step 5: Solve for x
   x = 1,050,089.22/1,172.80
6. Step 6: Final answer
   x = 895.37