Finding the Fourth Proportional to 139.37, 208.82 and 98.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139.37 : 208.82 = 98.59 : x
2. Step 2: Convert to fraction form
   139.37/208.82 = 98.59/x
3. Step 3: Cross multiply
   139.37x = 208.82 × 98.59
4. Step 4: Simplify right side
   139.37x = 20,586.52
5. Step 5: Solve for x
   x = 20,586.52/139.37
6. Step 6: Final answer
   x = 147.72