Finding the Fourth Proportional to 72.50, 108.54 and 53.19

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 108.54 = 53.19 : x
2. Step 2: Convert to fraction form
   72.50/108.54 = 53.19/x
3. Step 3: Cross multiply
   72.50x = 108.54 × 53.19
4. Step 4: Simplify right side
   72.50x = 5,773.24
5. Step 5: Solve for x
   x = 5,773.24/72.50
6. Step 6: Final answer
   x = 79.64