Finding the Fourth Proportional to 89.91, 123.72 and 74.01

Step by Step Solution

1. Step 1: Write the proportion equation
   89.91 : 123.72 = 74.01 : x
2. Step 2: Convert to fraction form
   89.91/123.72 = 74.01/x
3. Step 3: Cross multiply
   89.91x = 123.72 × 74.01
4. Step 4: Simplify right side
   89.91x = 9,156.52
5. Step 5: Solve for x
   x = 9,156.52/89.91
6. Step 6: Final answer
   x = 101.84