Finding the Fourth Proportional to 83.30, 124.98 and 31.98

Step by Step Solution

1. Step 1: Write the proportion equation
   83.30 : 124.98 = 31.98 : x
2. Step 2: Convert to fraction form
   83.30/124.98 = 31.98/x
3. Step 3: Cross multiply
   83.30x = 124.98 × 31.98
4. Step 4: Simplify right side
   83.30x = 3,996.86
5. Step 5: Solve for x
   x = 3,996.86/83.30
6. Step 6: Final answer
   x = 47.98