Finding the Fourth Proportional to 90.73, 136.14 and 42.63

Step by Step Solution

1. Step 1: Write the proportion equation
   90.73 : 136.14 = 42.63 : x
2. Step 2: Convert to fraction form
   90.73/136.14 = 42.63/x
3. Step 3: Cross multiply
   90.73x = 136.14 × 42.63
4. Step 4: Simplify right side
   90.73x = 5,802.75
5. Step 5: Solve for x
   x = 5,802.75/90.73
6. Step 6: Final answer
   x = 63.96