Finding the Fourth Proportional to 139.05, 191.86 and 83.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139.05 : 191.86 = 83.06 : x
2. Step 2: Convert to fraction form
   139.05/191.86 = 83.06/x
3. Step 3: Cross multiply
   139.05x = 191.86 × 83.06
4. Step 4: Simplify right side
   139.05x = 15,935.89
5. Step 5: Solve for x
   x = 15,935.89/139.05
6. Step 6: Final answer
   x = 114.61