Finding the Fourth Proportional to 42,704.82, 64,049.94 and 20,217.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,704.82 : 64,049.94 = 20,217.60 : x
2. Step 2: Convert to fraction form
   42,704.82/64,049.94 = 20,217.60/x
3. Step 3: Cross multiply
   42,704.82x = 64,049.94 × 20,217.60
4. Step 4: Simplify right side
   42,704.82x = 1,294,936,066.94
5. Step 5: Solve for x
   x = 1,294,936,066.94/42,704.82
6. Step 6: Final answer
   x = 30,322.95