Finding the Fourth Proportional to 85.72, 128.58 and 37.63

Step by Step Solution

1. Step 1: Write the proportion equation
   85.72 : 128.58 = 37.63 : x
2. Step 2: Convert to fraction form
   85.72/128.58 = 37.63/x
3. Step 3: Cross multiply
   85.72x = 128.58 × 37.63
4. Step 4: Simplify right side
   85.72x = 4,837.82
5. Step 5: Solve for x
   x = 4,837.82/85.72
6. Step 6: Final answer
   x = 56.44