Finding the Fourth Proportional to 89.87, 134.55 and 59.31

Step by Step Solution

1. Step 1: Write the proportion equation
   89.87 : 134.55 = 59.31 : x
2. Step 2: Convert to fraction form
   89.87/134.55 = 59.31/x
3. Step 3: Cross multiply
   89.87x = 134.55 × 59.31
4. Step 4: Simplify right side
   89.87x = 7,980.16
5. Step 5: Solve for x
   x = 7,980.16/89.87
6. Step 6: Final answer
   x = 88.80