Finding the Fourth Proportional to 45.98, 69.18 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   45.98 : 69.18 = 42.20 : x
2. Step 2: Convert to fraction form
   45.98/69.18 = 42.20/x
3. Step 3: Cross multiply
   45.98x = 69.18 × 42.20
4. Step 4: Simplify right side
   45.98x = 2,919.40
5. Step 5: Solve for x
   x = 2,919.40/45.98
6. Step 6: Final answer
   x = 63.49