Finding the Fourth Proportional to 42,709.89, 64,104.21 and 21,664.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,709.89 : 64,104.21 = 21,664.71 : x
2. Step 2: Convert to fraction form
   42,709.89/64,104.21 = 21,664.71/x
3. Step 3: Cross multiply
   42,709.89x = 64,104.21 × 21,664.71
4. Step 4: Simplify right side
   42,709.89x = 1,388,799,119.43
5. Step 5: Solve for x
   x = 1,388,799,119.43/42,709.89
6. Step 6: Final answer
   x = 32,517.04