Finding the Fourth Proportional to 72.72, 100.88 and 70.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72.72 : 100.88 = 70.20 : x
2. Step 2: Convert to fraction form
   72.72/100.88 = 70.20/x
3. Step 3: Cross multiply
   72.72x = 100.88 × 70.20
4. Step 4: Simplify right side
   72.72x = 7,081.43
5. Step 5: Solve for x
   x = 7,081.43/72.72
6. Step 6: Final answer
   x = 97.38