Finding the Fourth Proportional to 35.98, 53.75 and 35.31

Step by Step Solution

1. Step 1: Write the proportion equation
   35.98 : 53.75 = 35.31 : x
2. Step 2: Convert to fraction form
   35.98/53.75 = 35.31/x
3. Step 3: Cross multiply
   35.98x = 53.75 × 35.31
4. Step 4: Simplify right side
   35.98x = 1,897.91
5. Step 5: Solve for x
   x = 1,897.91/35.98
6. Step 6: Final answer
   x = 52.75