Finding the Fourth Proportional to 42,721.38, 64,121.22 and 21,676.34

Step by Step Solution

1. Step 1: Write the proportion equation
   42,721.38 : 64,121.22 = 21,676.34 : x
2. Step 2: Convert to fraction form
   42,721.38/64,121.22 = 21,676.34/x
3. Step 3: Cross multiply
   42,721.38x = 64,121.22 × 21,676.34
4. Step 4: Simplify right side
   42,721.38x = 1,389,913,365.93
5. Step 5: Solve for x
   x = 1,389,913,365.93/42,721.38
6. Step 6: Final answer
   x = 32,534.37