Finding the Fourth Proportional to 89.72, 123.84 and 62.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89.72 : 123.84 = 62.12 : x
2. Step 2: Convert to fraction form
   89.72/123.84 = 62.12/x
3. Step 3: Cross multiply
   89.72x = 123.84 × 62.12
4. Step 4: Simplify right side
   89.72x = 7,692.94
5. Step 5: Solve for x
   x = 7,692.94/89.72
6. Step 6: Final answer
   x = 85.74