Finding the Fourth Proportional to 213,896.72, 320,918.01 and 80,815.34

Step by Step Solution

1. Step 1: Write the proportion equation
   213,896.72 : 320,918.01 = 80,815.34 : x
2. Step 2: Convert to fraction form
   213,896.72/320,918.01 = 80,815.34/x
3. Step 3: Cross multiply
   213,896.72x = 320,918.01 × 80,815.34
4. Step 4: Simplify right side
   213,896.72x = 25,935,098,090.27
5. Step 5: Solve for x
   x = 25,935,098,090.27/213,896.72
6. Step 6: Final answer
   x = 121,250.56