Finding the Fourth Proportional to 1,099.91, 1,518.17 and 628.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.91 : 1,518.17 = 628.06 : x
2. Step 2: Convert to fraction form
   1,099.91/1,518.17 = 628.06/x
3. Step 3: Cross multiply
   1,099.91x = 1,518.17 × 628.06
4. Step 4: Simplify right side
   1,099.91x = 953,501.85
5. Step 5: Solve for x
   x = 953,501.85/1,099.91
6. Step 6: Final answer
   x = 866.89