Finding the Fourth Proportional to 89.99, 134.83 and 71.76

Step by Step Solution

1. Step 1: Write the proportion equation
   89.99 : 134.83 = 71.76 : x
2. Step 2: Convert to fraction form
   89.99/134.83 = 71.76/x
3. Step 3: Cross multiply
   89.99x = 134.83 × 71.76
4. Step 4: Simplify right side
   89.99x = 9,675.22
5. Step 5: Solve for x
   x = 9,675.22/89.99
6. Step 6: Final answer
   x = 107.52