Finding the Fourth Proportional to 72.93, 100.74 and 72.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72.93 : 100.74 = 72.12 : x
2. Step 2: Convert to fraction form
   72.93/100.74 = 72.12/x
3. Step 3: Cross multiply
   72.93x = 100.74 × 72.12
4. Step 4: Simplify right side
   72.93x = 7,265.37
5. Step 5: Solve for x
   x = 7,265.37/72.93
6. Step 6: Final answer
   x = 99.62