Finding the Fourth Proportional to 83.31, 124.89 and 31.22

Step by Step Solution

1. Step 1: Write the proportion equation
   83.31 : 124.89 = 31.22 : x
2. Step 2: Convert to fraction form
   83.31/124.89 = 31.22/x
3. Step 3: Cross multiply
   83.31x = 124.89 × 31.22
4. Step 4: Simplify right side
   83.31x = 3,898.47
5. Step 5: Solve for x
   x = 3,898.47/83.31
6. Step 6: Final answer
   x = 46.79