Finding the Fourth Proportional to 1,100.55, 1,518.66 and 628.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.55 : 1,518.66 = 628.56 : x
2. Step 2: Convert to fraction form
   1,100.55/1,518.66 = 628.56/x
3. Step 3: Cross multiply
   1,100.55x = 1,518.66 × 628.56
4. Step 4: Simplify right side
   1,100.55x = 954,568.93
5. Step 5: Solve for x
   x = 954,568.93/1,100.55
6. Step 6: Final answer
   x = 867.36