Finding the Fourth Proportional to 139.06, 191.88 and 83.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139.06 : 191.88 = 83.82 : x
2. Step 2: Convert to fraction form
   139.06/191.88 = 83.82/x
3. Step 3: Cross multiply
   139.06x = 191.88 × 83.82
4. Step 4: Simplify right side
   139.06x = 16,083.38
5. Step 5: Solve for x
   x = 16,083.38/139.06
6. Step 6: Final answer
   x = 115.66