Finding the Fourth Proportional to 1,100.55, 1,650.98 and 397.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.55 : 1,650.98 = 397.71 : x
2. Step 2: Convert to fraction form
   1,100.55/1,650.98 = 397.71/x
3. Step 3: Cross multiply
   1,100.55x = 1,650.98 × 397.71
4. Step 4: Simplify right side
   1,100.55x = 656,603.00
5. Step 5: Solve for x
   x = 656,603.00/1,100.55
6. Step 6: Final answer
   x = 596.61