Finding the Fourth Proportional to 170.89, 235.89 and 100.98

Step by Step Solution

1. Step 1: Write the proportion equation
   170.89 : 235.89 = 100.98 : x
2. Step 2: Convert to fraction form
   170.89/235.89 = 100.98/x
3. Step 3: Cross multiply
   170.89x = 235.89 × 100.98
4. Step 4: Simplify right side
   170.89x = 23,820.17
5. Step 5: Solve for x
   x = 23,820.17/170.89
6. Step 6: Final answer
   x = 139.39