Finding the Fourth Proportional to 139.69, 192.71 and 93.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139.69 : 192.71 = 93.05 : x
2. Step 2: Convert to fraction form
   139.69/192.71 = 93.05/x
3. Step 3: Cross multiply
   139.69x = 192.71 × 93.05
4. Step 4: Simplify right side
   139.69x = 17,931.66
5. Step 5: Solve for x
   x = 17,931.66/139.69
6. Step 6: Final answer
   x = 128.37