Finding the Fourth Proportional to 72.43, 99.99 and 50.35

Step by Step Solution

1. Step 1: Write the proportion equation
   72.43 : 99.99 = 50.35 : x
2. Step 2: Convert to fraction form
   72.43/99.99 = 50.35/x
3. Step 3: Cross multiply
   72.43x = 99.99 × 50.35
4. Step 4: Simplify right side
   72.43x = 5,034.50
5. Step 5: Solve for x
   x = 5,034.50/72.43
6. Step 6: Final answer
   x = 69.51