Finding the Fourth Proportional to 42.30, 58.45 and 34.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42.30 : 58.45 = 34.10 : x
2. Step 2: Convert to fraction form
   42.30/58.45 = 34.10/x
3. Step 3: Cross multiply
   42.30x = 58.45 × 34.10
4. Step 4: Simplify right side
   42.30x = 1,993.15
5. Step 5: Solve for x
   x = 1,993.15/42.30
6. Step 6: Final answer
   x = 47.12