Finding the Fourth Proportional to 72.50, 108.79 and 34.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 108.79 = 34.50 : x
2. Step 2: Convert to fraction form
   72.50/108.79 = 34.50/x
3. Step 3: Cross multiply
   72.50x = 108.79 × 34.50
4. Step 4: Simplify right side
   72.50x = 3,753.26
5. Step 5: Solve for x
   x = 3,753.26/72.50
6. Step 6: Final answer
   x = 51.77