Finding the Fourth Proportional to 89.51, 123.42 and 73.91

Step by Step Solution

1. Step 1: Write the proportion equation
   89.51 : 123.42 = 73.91 : x
2. Step 2: Convert to fraction form
   89.51/123.42 = 73.91/x
3. Step 3: Cross multiply
   89.51x = 123.42 × 73.91
4. Step 4: Simplify right side
   89.51x = 9,122.56
5. Step 5: Solve for x
   x = 9,122.56/89.51
6. Step 6: Final answer
   x = 101.92