Finding the Fourth Proportional to 42.98, 64.61 and 42.35

Step by Step Solution

1. Step 1: Write the proportion equation
   42.98 : 64.61 = 42.35 : x
2. Step 2: Convert to fraction form
   42.98/64.61 = 42.35/x
3. Step 3: Cross multiply
   42.98x = 64.61 × 42.35
4. Step 4: Simplify right side
   42.98x = 2,736.02
5. Step 5: Solve for x
   x = 2,736.02/42.98
6. Step 6: Final answer
   x = 63.66