Finding the Fourth Proportional to 155.34, 233.15 and 131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   155.34 : 233.15 = 131.31 : x
2. Step 2: Convert to fraction form
   155.34/233.15 = 131.31/x
3. Step 3: Cross multiply
   155.34x = 233.15 × 131.31
4. Step 4: Simplify right side
   155.34x = 30,614.27
5. Step 5: Solve for x
   x = 30,614.27/155.34
6. Step 6: Final answer
   x = 197.08