Finding the Fourth Proportional to 72.80, 109.18 and 50.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72.80 : 109.18 = 50.02 : x
2. Step 2: Convert to fraction form
   72.80/109.18 = 50.02/x
3. Step 3: Cross multiply
   72.80x = 109.18 × 50.02
4. Step 4: Simplify right side
   72.80x = 5,461.18
5. Step 5: Solve for x
   x = 5,461.18/72.80
6. Step 6: Final answer
   x = 75.02