Finding the Fourth Proportional to 105.21, 144.93 and 83.34

Step by Step Solution

1. Step 1: Write the proportion equation
   105.21 : 144.93 = 83.34 : x
2. Step 2: Convert to fraction form
   105.21/144.93 = 83.34/x
3. Step 3: Cross multiply
   105.21x = 144.93 × 83.34
4. Step 4: Simplify right side
   105.21x = 12,078.47
5. Step 5: Solve for x
   x = 12,078.47/105.21
6. Step 6: Final answer
   x = 114.80