Finding the Fourth Proportional to 86.89, 130.27 and 42.94

Step by Step Solution

1. Step 1: Write the proportion equation
   86.89 : 130.27 = 42.94 : x
2. Step 2: Convert to fraction form
   86.89/130.27 = 42.94/x
3. Step 3: Cross multiply
   86.89x = 130.27 × 42.94
4. Step 4: Simplify right side
   86.89x = 5,593.79
5. Step 5: Solve for x
   x = 5,593.79/86.89
6. Step 6: Final answer
   x = 64.38