Finding the Fourth Proportional to 144.62, 216.71 and 57.86

Step by Step Solution

1. Step 1: Write the proportion equation
   144.62 : 216.71 = 57.86 : x
2. Step 2: Convert to fraction form
   144.62/216.71 = 57.86/x
3. Step 3: Cross multiply
   144.62x = 216.71 × 57.86
4. Step 4: Simplify right side
   144.62x = 12,538.50
5. Step 5: Solve for x
   x = 12,538.50/144.62
6. Step 6: Final answer
   x = 86.70