Finding the Fourth Proportional to 72.42, 99.42 and 72.06

Step by Step Solution

1. Step 1: Write the proportion equation
   72.42 : 99.42 = 72.06 : x
2. Step 2: Convert to fraction form
   72.42/99.42 = 72.06/x
3. Step 3: Cross multiply
   72.42x = 99.42 × 72.06
4. Step 4: Simplify right side
   72.42x = 7,164.21
5. Step 5: Solve for x
   x = 7,164.21/72.42
6. Step 6: Final answer
   x = 98.93