Finding the Fourth Proportional to 111.83, 154.23 and 72.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111.83 : 154.23 = 72.50 : x
2. Step 2: Convert to fraction form
   111.83/154.23 = 72.50/x
3. Step 3: Cross multiply
   111.83x = 154.23 × 72.50
4. Step 4: Simplify right side
   111.83x = 11,180.90
5. Step 5: Solve for x
   x = 11,180.90/111.83
6. Step 6: Final answer
   x = 99.99