Finding the Fourth Proportional to 89.74, 134.72 and 71.52

Step by Step Solution

1. Step 1: Write the proportion equation
   89.74 : 134.72 = 71.52 : x
2. Step 2: Convert to fraction form
   89.74/134.72 = 71.52/x
3. Step 3: Cross multiply
   89.74x = 134.72 × 71.52
4. Step 4: Simplify right side
   89.74x = 9,635.17
5. Step 5: Solve for x
   x = 9,635.17/89.74
6. Step 6: Final answer
   x = 107.37