Finding the Fourth Proportional to 280,243.34, 420,435.42 and 80,564.09

Step by Step Solution

1. Step 1: Write the proportion equation
   280,243.34 : 420,435.42 = 80,564.09 : x
2. Step 2: Convert to fraction form
   280,243.34/420,435.42 = 80,564.09/x
3. Step 3: Cross multiply
   280,243.34x = 420,435.42 × 80,564.09
4. Step 4: Simplify right side
   280,243.34x = 33,871,997,016.07
5. Step 5: Solve for x
   x = 33,871,997,016.07/280,243.34
6. Step 6: Final answer
   x = 120,866.38