Finding the Fourth Proportional to 72.50, 100.08 and 50.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 100.08 = 50.69 : x
2. Step 2: Convert to fraction form
   72.50/100.08 = 50.69/x
3. Step 3: Cross multiply
   72.50x = 100.08 × 50.69
4. Step 4: Simplify right side
   72.50x = 5,073.31
5. Step 5: Solve for x
   x = 5,073.31/72.50
6. Step 6: Final answer
   x = 69.98