Finding the Fourth Proportional to 42,772.73, 64,137.42 and 20,276.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,772.73 : 64,137.42 = 20,276.60 : x
2. Step 2: Convert to fraction form
   42,772.73/64,137.42 = 20,276.60/x
3. Step 3: Cross multiply
   42,772.73x = 64,137.42 × 20,276.60
4. Step 4: Simplify right side
   42,772.73x = 1,300,488,489.68
5. Step 5: Solve for x
   x = 1,300,488,489.68/42,772.73
6. Step 6: Final answer
   x = 30,404.62