Finding the Fourth Proportional to 42.30, 57.95 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.30 : 57.95 = 42.18 : x
2. Step 2: Convert to fraction form
   42.30/57.95 = 42.18/x
3. Step 3: Cross multiply
   42.30x = 57.95 × 42.18
4. Step 4: Simplify right side
   42.30x = 2,444.12
5. Step 5: Solve for x
   x = 2,444.12/42.30
6. Step 6: Final answer
   x = 57.78