Finding the Fourth Proportional to 72.50, 99.63 and 57.92

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 99.63 = 57.92 : x
2. Step 2: Convert to fraction form
   72.50/99.63 = 57.92/x
3. Step 3: Cross multiply
   72.50x = 99.63 × 57.92
4. Step 4: Simplify right side
   72.50x = 5,770.71
5. Step 5: Solve for x
   x = 5,770.71/72.50
6. Step 6: Final answer
   x = 79.59