Finding the Fourth Proportional to 89.48, 134.15 and 43.80

Step by Step Solution

1. Step 1: Write the proportion equation
   89.48 : 134.15 = 43.80 : x
2. Step 2: Convert to fraction form
   89.48/134.15 = 43.80/x
3. Step 3: Cross multiply
   89.48x = 134.15 × 43.80
4. Step 4: Simplify right side
   89.48x = 5,875.55
5. Step 5: Solve for x
   x = 5,875.55/89.48
6. Step 6: Final answer
   x = 65.67