Finding the Fourth Proportional to 91.50, 137.09 and 89.98

Step by Step Solution

1. Step 1: Write the proportion equation
   91.50 : 137.09 = 89.98 : x
2. Step 2: Convert to fraction form
   91.50/137.09 = 89.98/x
3. Step 3: Cross multiply
   91.50x = 137.09 × 89.98
4. Step 4: Simplify right side
   91.50x = 12,335.24
5. Step 5: Solve for x
   x = 12,335.24/91.50
6. Step 6: Final answer
   x = 134.82