Finding the Fourth Proportional to 42.20, 63.18 and 34.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42.20 : 63.18 = 34.50 : x
2. Step 2: Convert to fraction form
   42.20/63.18 = 34.50/x
3. Step 3: Cross multiply
   42.20x = 63.18 × 34.50
4. Step 4: Simplify right side
   42.20x = 2,179.71
5. Step 5: Solve for x
   x = 2,179.71/42.20
6. Step 6: Final answer
   x = 51.66