Finding the Fourth Proportional to 139.16, 192.01 and 99.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139.16 : 192.01 = 99.82 : x
2. Step 2: Convert to fraction form
   139.16/192.01 = 99.82/x
3. Step 3: Cross multiply
   139.16x = 192.01 × 99.82
4. Step 4: Simplify right side
   139.16x = 19,165.35
5. Step 5: Solve for x
   x = 19,165.35/139.16
6. Step 6: Final answer
   x = 137.72