Finding the Fourth Proportional to 1,086.57, 1,626.21 and 738.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.57 : 1,626.21 = 738.47 : x
2. Step 2: Convert to fraction form
   1,086.57/1,626.21 = 738.47/x
3. Step 3: Cross multiply
   1,086.57x = 1,626.21 × 738.47
4. Step 4: Simplify right side
   1,086.57x = 1,200,911.36
5. Step 5: Solve for x
   x = 1,200,911.36/1,086.57
6. Step 6: Final answer
   x = 1,105.23