Finding the Fourth Proportional to 139.50, 209.22 and 93.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139.50 : 209.22 = 93.72 : x
2. Step 2: Convert to fraction form
   139.50/209.22 = 93.72/x
3. Step 3: Cross multiply
   139.50x = 209.22 × 93.72
4. Step 4: Simplify right side
   139.50x = 19,608.10
5. Step 5: Solve for x
   x = 19,608.10/139.50
6. Step 6: Final answer
   x = 140.56