Finding the Fourth Proportional to 139.96, 209.83 and 53.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139.96 : 209.83 = 53.25 : x
2. Step 2: Convert to fraction form
   139.96/209.83 = 53.25/x
3. Step 3: Cross multiply
   139.96x = 209.83 × 53.25
4. Step 4: Simplify right side
   139.96x = 11,173.45
5. Step 5: Solve for x
   x = 11,173.45/139.96
6. Step 6: Final answer
   x = 79.84