Finding the Fourth Proportional to 139.50, 192.58 and 100.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139.50 : 192.58 = 100.24 : x
2. Step 2: Convert to fraction form
   139.50/192.58 = 100.24/x
3. Step 3: Cross multiply
   139.50x = 192.58 × 100.24
4. Step 4: Simplify right side
   139.50x = 19,303.49
5. Step 5: Solve for x
   x = 19,303.49/139.50
6. Step 6: Final answer
   x = 138.38