Finding the Fourth Proportional to 139.50, 192.50 and 77.33

Step by Step Solution

1. Step 1: Write the proportion equation
   139.50 : 192.50 = 77.33 : x
2. Step 2: Convert to fraction form
   139.50/192.50 = 77.33/x
3. Step 3: Cross multiply
   139.50x = 192.50 × 77.33
4. Step 4: Simplify right side
   139.50x = 14,886.55
5. Step 5: Solve for x
   x = 14,886.55/139.50
6. Step 6: Final answer
   x = 106.71