Finding the Fourth Proportional to 42.70, 57.83 and 42.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42.70 : 57.83 = 42.70 : x
2. Step 2: Convert to fraction form
   42.70/57.83 = 42.70/x
3. Step 3: Cross multiply
   42.70x = 57.83 × 42.70
4. Step 4: Simplify right side
   42.70x = 2,469.34
5. Step 5: Solve for x
   x = 2,469.34/42.70
6. Step 6: Final answer
   x = 57.83