Finding the Fourth Proportional to 90.50, 125.00 and 83.61

Step by Step Solution

1. Step 1: Write the proportion equation
   90.50 : 125.00 = 83.61 : x
2. Step 2: Convert to fraction form
   90.50/125.00 = 83.61/x
3. Step 3: Cross multiply
   90.50x = 125.00 × 83.61
4. Step 4: Simplify right side
   90.50x = 10,450.83
5. Step 5: Solve for x
   x = 10,450.83/90.50
6. Step 6: Final answer
   x = 115.49