Finding the Fourth Proportional to 72.58, 100.20 and 67.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.58 : 100.20 = 67.72 : x
2. Step 2: Convert to fraction form
   72.58/100.20 = 67.72/x
3. Step 3: Cross multiply
   72.58x = 100.20 × 67.72
4. Step 4: Simplify right side
   72.58x = 6,785.54
5. Step 5: Solve for x
   x = 6,785.54/72.58
6. Step 6: Final answer
   x = 93.49