Finding the Fourth Proportional to 72.48, 99.87 and 50.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72.48 : 99.87 = 50.61 : x
2. Step 2: Convert to fraction form
   72.48/99.87 = 50.61/x
3. Step 3: Cross multiply
   72.48x = 99.87 × 50.61
4. Step 4: Simplify right side
   72.48x = 5,054.42
5. Step 5: Solve for x
   x = 5,054.42/72.48
6. Step 6: Final answer
   x = 69.74