Finding the Fourth Proportional to 42,801.96, 64,229.59 and 20,617.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,801.96 : 64,229.59 = 20,617.58 : x
2. Step 2: Convert to fraction form
   42,801.96/64,229.59 = 20,617.58/x
3. Step 3: Cross multiply
   42,801.96x = 64,229.59 × 20,617.58
4. Step 4: Simplify right side
   42,801.96x = 1,324,258,710.19
5. Step 5: Solve for x
   x = 1,324,258,710.19/42,801.96
6. Step 6: Final answer
   x = 30,939.21