Finding the Fourth Proportional to 49.56, 74.64 and 42.50

Step by Step Solution

1. Step 1: Write the proportion equation
   49.56 : 74.64 = 42.50 : x
2. Step 2: Convert to fraction form
   49.56/74.64 = 42.50/x
3. Step 3: Cross multiply
   49.56x = 74.64 × 42.50
4. Step 4: Simplify right side
   49.56x = 3,171.83
5. Step 5: Solve for x
   x = 3,171.83/49.56
6. Step 6: Final answer
   x = 64.00