Finding the Fourth Proportional to 71.88, 107.25 and 67.50

Step by Step Solution

1. Step 1: Write the proportion equation
   71.88 : 107.25 = 67.50 : x
2. Step 2: Convert to fraction form
   71.88/107.25 = 67.50/x
3. Step 3: Cross multiply
   71.88x = 107.25 × 67.50
4. Step 4: Simplify right side
   71.88x = 7,239.12
5. Step 5: Solve for x
   x = 7,239.12/71.88
6. Step 6: Final answer
   x = 100.72