Finding the Fourth Proportional to 72.40, 99.99 and 52.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72.40 : 99.99 = 52.69 : x
2. Step 2: Convert to fraction form
   72.40/99.99 = 52.69/x
3. Step 3: Cross multiply
   72.40x = 99.99 × 52.69
4. Step 4: Simplify right side
   72.40x = 5,269.16
5. Step 5: Solve for x
   x = 5,269.16/72.40
6. Step 6: Final answer
   x = 72.78