Finding the Fourth Proportional to 42.50, 58.61 and 34.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42.50 : 58.61 = 34.20 : x
2. Step 2: Convert to fraction form
   42.50/58.61 = 34.20/x
3. Step 3: Cross multiply
   42.50x = 58.61 × 34.20
4. Step 4: Simplify right side
   42.50x = 2,004.55
5. Step 5: Solve for x
   x = 2,004.55/42.50
6. Step 6: Final answer
   x = 47.16