Finding the Fourth Proportional to 43.42, 65.22 and 42.70

Step by Step Solution

1. Step 1: Write the proportion equation
   43.42 : 65.22 = 42.70 : x
2. Step 2: Convert to fraction form
   43.42/65.22 = 42.70/x
3. Step 3: Cross multiply
   43.42x = 65.22 × 42.70
4. Step 4: Simplify right side
   43.42x = 2,784.89
5. Step 5: Solve for x
   x = 2,784.89/43.42
6. Step 6: Final answer
   x = 64.14