Finding the Fourth Proportional to 1,172.56, 1,618.32 and 675.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.56 : 1,618.32 = 675.28 : x
2. Step 2: Convert to fraction form
   1,172.56/1,618.32 = 675.28/x
3. Step 3: Cross multiply
   1,172.56x = 1,618.32 × 675.28
4. Step 4: Simplify right side
   1,172.56x = 1,092,819.13
5. Step 5: Solve for x
   x = 1,092,819.13/1,172.56
6. Step 6: Final answer
   x = 931.99