Finding the Fourth Proportional to 103.77, 142.86 and 90.82

Step by Step Solution

1. Step 1: Write the proportion equation
   103.77 : 142.86 = 90.82 : x
2. Step 2: Convert to fraction form
   103.77/142.86 = 90.82/x
3. Step 3: Cross multiply
   103.77x = 142.86 × 90.82
4. Step 4: Simplify right side
   103.77x = 12,974.55
5. Step 5: Solve for x
   x = 12,974.55/103.77
6. Step 6: Final answer
   x = 125.03