Finding the Fourth Proportional to 90.00, 134.89 and 43.75

Step by Step Solution

1. Step 1: Write the proportion equation
   90.00 : 134.89 = 43.75 : x
2. Step 2: Convert to fraction form
   90.00/134.89 = 43.75/x
3. Step 3: Cross multiply
   90.00x = 134.89 × 43.75
4. Step 4: Simplify right side
   90.00x = 5,900.54
5. Step 5: Solve for x
   x = 5,900.54/90.00
6. Step 6: Final answer
   x = 65.57