Finding the Fourth Proportional to 70.55, 105.72 and 31.98

Step by Step Solution

1. Step 1: Write the proportion equation
   70.55 : 105.72 = 31.98 : x
2. Step 2: Convert to fraction form
   70.55/105.72 = 31.98/x
3. Step 3: Cross multiply
   70.55x = 105.72 × 31.98
4. Step 4: Simplify right side
   70.55x = 3,381.20
5. Step 5: Solve for x
   x = 3,381.20/70.55
6. Step 6: Final answer
   x = 47.93