Finding the Fourth Proportional to 139.48, 192.50 and 100.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139.48 : 192.50 = 100.69 : x
2. Step 2: Convert to fraction form
   139.48/192.50 = 100.69/x
3. Step 3: Cross multiply
   139.48x = 192.50 × 100.69
4. Step 4: Simplify right side
   139.48x = 19,382.83
5. Step 5: Solve for x
   x = 19,382.83/139.48
6. Step 6: Final answer
   x = 138.96