Finding the Fourth Proportional to 42,826.69, 64,203.10 and 20,609.51

Step by Step Solution

1. Step 1: Write the proportion equation
   42,826.69 : 64,203.10 = 20,609.51 : x
2. Step 2: Convert to fraction form
   42,826.69/64,203.10 = 20,609.51/x
3. Step 3: Cross multiply
   42,826.69x = 64,203.10 × 20,609.51
4. Step 4: Simplify right side
   42,826.69x = 1,323,194,058.94
5. Step 5: Solve for x
   x = 1,323,194,058.94/42,826.69
6. Step 6: Final answer
   x = 30,896.48