Finding the Fourth Proportional to 139.62, 192.72 and 113.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139.62 : 192.72 = 113.34 : x
2. Step 2: Convert to fraction form
   139.62/192.72 = 113.34/x
3. Step 3: Cross multiply
   139.62x = 192.72 × 113.34
4. Step 4: Simplify right side
   139.62x = 21,842.88
5. Step 5: Solve for x
   x = 21,842.88/139.62
6. Step 6: Final answer
   x = 156.45