Finding the Fourth Proportional to 42.93, 64.89 and 42.39

Step by Step Solution

1. Step 1: Write the proportion equation
   42.93 : 64.89 = 42.39 : x
2. Step 2: Convert to fraction form
   42.93/64.89 = 42.39/x
3. Step 3: Cross multiply
   42.93x = 64.89 × 42.39
4. Step 4: Simplify right side
   42.93x = 2,750.69
5. Step 5: Solve for x
   x = 2,750.69/42.93
6. Step 6: Final answer
   x = 64.07