Finding the Fourth Proportional to 139.69, 209.42 and 67.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139.69 : 209.42 = 67.50 : x
2. Step 2: Convert to fraction form
   139.69/209.42 = 67.50/x
3. Step 3: Cross multiply
   139.69x = 209.42 × 67.50
4. Step 4: Simplify right side
   139.69x = 14,135.77
5. Step 5: Solve for x
   x = 14,135.77/139.69
6. Step 6: Final answer
   x = 101.19