Finding the Fourth Proportional to 72.50, 108.77 and 31.93

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 108.77 = 31.93 : x
2. Step 2: Convert to fraction form
   72.50/108.77 = 31.93/x
3. Step 3: Cross multiply
   72.50x = 108.77 × 31.93
4. Step 4: Simplify right side
   72.50x = 3,472.59
5. Step 5: Solve for x
   x = 3,472.59/72.50
6. Step 6: Final answer
   x = 47.90