Finding the Fourth Proportional to 90.74, 136.12 and 73.77

Step by Step Solution

1. Step 1: Write the proportion equation
   90.74 : 136.12 = 73.77 : x
2. Step 2: Convert to fraction form
   90.74/136.12 = 73.77/x
3. Step 3: Cross multiply
   90.74x = 136.12 × 73.77
4. Step 4: Simplify right side
   90.74x = 10,040.89
5. Step 5: Solve for x
   x = 10,040.89/90.74
6. Step 6: Final answer
   x = 110.66