Finding the Fourth Proportional to 73.42, 100.70 and 72.09

Step by Step Solution

1. Step 1: Write the proportion equation
   73.42 : 100.70 = 72.09 : x
2. Step 2: Convert to fraction form
   73.42/100.70 = 72.09/x
3. Step 3: Cross multiply
   73.42x = 100.70 × 72.09
4. Step 4: Simplify right side
   73.42x = 7,259.46
5. Step 5: Solve for x
   x = 7,259.46/73.42
6. Step 6: Final answer
   x = 98.88