Finding the Fourth Proportional to 42.18, 63.21 and 34.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42.18 : 63.21 = 34.17 : x
2. Step 2: Convert to fraction form
   42.18/63.21 = 34.17/x
3. Step 3: Cross multiply
   42.18x = 63.21 × 34.17
4. Step 4: Simplify right side
   42.18x = 2,159.89
5. Step 5: Solve for x
   x = 2,159.89/42.18
6. Step 6: Final answer
   x = 51.21