Finding the Fourth Proportional to 128.69, 192.86 and 83.01

Step by Step Solution

1. Step 1: Write the proportion equation
   128.69 : 192.86 = 83.01 : x
2. Step 2: Convert to fraction form
   128.69/192.86 = 83.01/x
3. Step 3: Cross multiply
   128.69x = 192.86 × 83.01
4. Step 4: Simplify right side
   128.69x = 16,008.89
5. Step 5: Solve for x
   x = 16,008.89/128.69
6. Step 6: Final answer
   x = 124.40