Finding the Fourth Proportional to 139.82, 192.76 and 100.51

Step by Step Solution

1. Step 1: Write the proportion equation
   139.82 : 192.76 = 100.51 : x
2. Step 2: Convert to fraction form
   139.82/192.76 = 100.51/x
3. Step 3: Cross multiply
   139.82x = 192.76 × 100.51
4. Step 4: Simplify right side
   139.82x = 19,374.31
5. Step 5: Solve for x
   x = 19,374.31/139.82
6. Step 6: Final answer
   x = 138.57