Finding the Fourth Proportional to 139.14, 192.01 and 83.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139.14 : 192.01 = 83.91 : x
2. Step 2: Convert to fraction form
   139.14/192.01 = 83.91/x
3. Step 3: Cross multiply
   139.14x = 192.01 × 83.91
4. Step 4: Simplify right side
   139.14x = 16,111.56
5. Step 5: Solve for x
   x = 16,111.56/139.14
6. Step 6: Final answer
   x = 115.79