Finding the Fourth Proportional to 67.13, 100.71 and 28.61

Step by Step Solution

1. Step 1: Write the proportion equation
   67.13 : 100.71 = 28.61 : x
2. Step 2: Convert to fraction form
   67.13/100.71 = 28.61/x
3. Step 3: Cross multiply
   67.13x = 100.71 × 28.61
4. Step 4: Simplify right side
   67.13x = 2,880.81
5. Step 5: Solve for x
   x = 2,880.81/67.13
6. Step 6: Final answer
   x = 42.92