Finding the Fourth Proportional to 83.89, 126.37 and 65.98

Step by Step Solution

1. Step 1: Write the proportion equation
   83.89 : 126.37 = 65.98 : x
2. Step 2: Convert to fraction form
   83.89/126.37 = 65.98/x
3. Step 3: Cross multiply
   83.89x = 126.37 × 65.98
4. Step 4: Simplify right side
   83.89x = 8,337.89
5. Step 5: Solve for x
   x = 8,337.89/83.89
6. Step 6: Final answer
   x = 99.39