Finding the Fourth Proportional to 64.98, 89.69 and 42.02

Step by Step Solution

1. Step 1: Write the proportion equation
   64.98 : 89.69 = 42.02 : x
2. Step 2: Convert to fraction form
   64.98/89.69 = 42.02/x
3. Step 3: Cross multiply
   64.98x = 89.69 × 42.02
4. Step 4: Simplify right side
   64.98x = 3,768.77
5. Step 5: Solve for x
   x = 3,768.77/64.98
6. Step 6: Final answer
   x = 58.00