Finding the Fourth Proportional to 139.02, 191.81 and 83.73

Step by Step Solution

1. Step 1: Write the proportion equation
   139.02 : 191.81 = 83.73 : x
2. Step 2: Convert to fraction form
   139.02/191.81 = 83.73/x
3. Step 3: Cross multiply
   139.02x = 191.81 × 83.73
4. Step 4: Simplify right side
   139.02x = 16,059.83
5. Step 5: Solve for x
   x = 16,059.83/139.02
6. Step 6: Final answer
   x = 115.52