Finding the Fourth Proportional to 98.89, 147.59 and 85.98

Step by Step Solution

1. Step 1: Write the proportion equation
   98.89 : 147.59 = 85.98 : x
2. Step 2: Convert to fraction form
   98.89/147.59 = 85.98/x
3. Step 3: Cross multiply
   98.89x = 147.59 × 85.98
4. Step 4: Simplify right side
   98.89x = 12,689.79
5. Step 5: Solve for x
   x = 12,689.79/98.89
6. Step 6: Final answer
   x = 128.32