Finding the Fourth Proportional to 71.25, 106.88 and 28.50

Step by Step Solution

1. Step 1: Write the proportion equation
   71.25 : 106.88 = 28.50 : x
2. Step 2: Convert to fraction form
   71.25/106.88 = 28.50/x
3. Step 3: Cross multiply
   71.25x = 106.88 × 28.50
4. Step 4: Simplify right side
   71.25x = 3,045.94
5. Step 5: Solve for x
   x = 3,045.94/71.25
6. Step 6: Final answer
   x = 42.75