Finding the Fourth Proportional to 103.80, 155.73 and 35.31

Step by Step Solution

1. Step 1: Write the proportion equation
   103.80 : 155.73 = 35.31 : x
2. Step 2: Convert to fraction form
   103.80/155.73 = 35.31/x
3. Step 3: Cross multiply
   103.80x = 155.73 × 35.31
4. Step 4: Simplify right side
   103.80x = 5,498.83
5. Step 5: Solve for x
   x = 5,498.83/103.80
6. Step 6: Final answer
   x = 52.98