Finding the Fourth Proportional to 139.61, 192.69 and 100.33

Step by Step Solution

1. Step 1: Write the proportion equation
   139.61 : 192.69 = 100.33 : x
2. Step 2: Convert to fraction form
   139.61/192.69 = 100.33/x
3. Step 3: Cross multiply
   139.61x = 192.69 × 100.33
4. Step 4: Simplify right side
   139.61x = 19,332.59
5. Step 5: Solve for x
   x = 19,332.59/139.61
6. Step 6: Final answer
   x = 138.48