Finding the Fourth Proportional to 102.51, 141.37 and 83.98

Step by Step Solution

1. Step 1: Write the proportion equation
   102.51 : 141.37 = 83.98 : x
2. Step 2: Convert to fraction form
   102.51/141.37 = 83.98/x
3. Step 3: Cross multiply
   102.51x = 141.37 × 83.98
4. Step 4: Simplify right side
   102.51x = 11,871.69
5. Step 5: Solve for x
   x = 11,871.69/102.51
6. Step 6: Final answer
   x = 115.81