Finding the Fourth Proportional to 89.70, 123.83 and 65.18

Step by Step Solution

1. Step 1: Write the proportion equation
   89.70 : 123.83 = 65.18 : x
2. Step 2: Convert to fraction form
   89.70/123.83 = 65.18/x
3. Step 3: Cross multiply
   89.70x = 123.83 × 65.18
4. Step 4: Simplify right side
   89.70x = 8,071.61
5. Step 5: Solve for x
   x = 8,071.61/89.70
6. Step 6: Final answer
   x = 89.98