Finding the Fourth Proportional to 72.23, 99.50 and 67.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72.23 : 99.50 = 67.50 : x
2. Step 2: Convert to fraction form
   72.23/99.50 = 67.50/x
3. Step 3: Cross multiply
   72.23x = 99.50 × 67.50
4. Step 4: Simplify right side
   72.23x = 6,715.91
5. Step 5: Solve for x
   x = 6,715.91/72.23
6. Step 6: Final answer
   x = 92.99