Finding the Fourth Proportional to 72.50, 99.97 and 50.62

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 99.97 = 50.62 : x
2. Step 2: Convert to fraction form
   72.50/99.97 = 50.62/x
3. Step 3: Cross multiply
   72.50x = 99.97 × 50.62
4. Step 4: Simplify right side
   72.50x = 5,060.48
5. Step 5: Solve for x
   x = 5,060.48/72.50
6. Step 6: Final answer
   x = 69.80