Finding the Fourth Proportional to 89.55, 123.59 and 64.98

Step by Step Solution

1. Step 1: Write the proportion equation
   89.55 : 123.59 = 64.98 : x
2. Step 2: Convert to fraction form
   89.55/123.59 = 64.98/x
3. Step 3: Cross multiply
   89.55x = 123.59 × 64.98
4. Step 4: Simplify right side
   89.55x = 8,031.04
5. Step 5: Solve for x
   x = 8,031.04/89.55
6. Step 6: Final answer
   x = 89.68