Finding the Fourth Proportional to 105.02, 145.02 and 72.26

Step by Step Solution

1. Step 1: Write the proportion equation
   105.02 : 145.02 = 72.26 : x
2. Step 2: Convert to fraction form
   105.02/145.02 = 72.26/x
3. Step 3: Cross multiply
   105.02x = 145.02 × 72.26
4. Step 4: Simplify right side
   105.02x = 10,479.15
5. Step 5: Solve for x
   x = 10,479.15/105.02
6. Step 6: Final answer
   x = 99.78