Finding the Fourth Proportional to 42.88, 64.56 and 37

Step by Step Solution

1. Step 1: Write the proportion equation
   42.88 : 64.56 = 37 : x
2. Step 2: Convert to fraction form
   42.88/64.56 = 37/x
3. Step 3: Cross multiply
   42.88x = 64.56 × 37
4. Step 4: Simplify right side
   42.88x = 2,388.72
5. Step 5: Solve for x
   x = 2,388.72/42.88
6. Step 6: Final answer
   x = 55.71