Finding the Fourth Proportional to 103.89, 155.76 and 83.59

Step by Step Solution

1. Step 1: Write the proportion equation
   103.89 : 155.76 = 83.59 : x
2. Step 2: Convert to fraction form
   103.89/155.76 = 83.59/x
3. Step 3: Cross multiply
   103.89x = 155.76 × 83.59
4. Step 4: Simplify right side
   103.89x = 13,019.98
5. Step 5: Solve for x
   x = 13,019.98/103.89
6. Step 6: Final answer
   x = 125.32