Finding the Fourth Proportional to 1,172.72, 1,618.50 and 675.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.72 : 1,618.50 = 675.28 : x
2. Step 2: Convert to fraction form
   1,172.72/1,618.50 = 675.28/x
3. Step 3: Cross multiply
   1,172.72x = 1,618.50 × 675.28
4. Step 4: Simplify right side
   1,172.72x = 1,092,939.17
5. Step 5: Solve for x
   x = 1,092,939.17/1,172.72
6. Step 6: Final answer
   x = 931.97