Finding the Fourth Proportional to 139.73, 209.52 and 67.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139.73 : 209.52 = 67.50 : x
2. Step 2: Convert to fraction form
   139.73/209.52 = 67.50/x
3. Step 3: Cross multiply
   139.73x = 209.52 × 67.50
4. Step 4: Simplify right side
   139.73x = 14,142.60
5. Step 5: Solve for x
   x = 14,142.60/139.73
6. Step 6: Final answer
   x = 101.22