Finding the Fourth Proportional to 67.30, 100.91 and 28.81

Step by Step Solution

1. Step 1: Write the proportion equation
   67.30 : 100.91 = 28.81 : x
2. Step 2: Convert to fraction form
   67.30/100.91 = 28.81/x
3. Step 3: Cross multiply
   67.30x = 100.91 × 28.81
4. Step 4: Simplify right side
   67.30x = 2,907.22
5. Step 5: Solve for x
   x = 2,907.22/67.30
6. Step 6: Final answer
   x = 43.20