Finding the Fourth Proportional to 139.72, 192.60 and 123.32

Step by Step Solution

1. Step 1: Write the proportion equation
   139.72 : 192.60 = 123.32 : x
2. Step 2: Convert to fraction form
   139.72/192.60 = 123.32/x
3. Step 3: Cross multiply
   139.72x = 192.60 × 123.32
4. Step 4: Simplify right side
   139.72x = 23,751.43
5. Step 5: Solve for x
   x = 23,751.43/139.72
6. Step 6: Final answer
   x = 169.99