Finding the Fourth Proportional to 109.35, 150.73 and 72.50

Step by Step Solution

1. Step 1: Write the proportion equation
   109.35 : 150.73 = 72.50 : x
2. Step 2: Convert to fraction form
   109.35/150.73 = 72.50/x
3. Step 3: Cross multiply
   109.35x = 150.73 × 72.50
4. Step 4: Simplify right side
   109.35x = 10,926.99
5. Step 5: Solve for x
   x = 10,926.99/109.35
6. Step 6: Final answer
   x = 99.93