Finding the Fourth Proportional to 319,890.72, 479,837.43 and 83,216.31

Step by Step Solution

1. Step 1: Write the proportion equation
   319,890.72 : 479,837.43 = 83,216.31 : x
2. Step 2: Convert to fraction form
   319,890.72/479,837.43 = 83,216.31/x
3. Step 3: Cross multiply
   319,890.72x = 479,837.43 × 83,216.31
4. Step 4: Simplify right side
   319,890.72x = 39,930,300,324.48
5. Step 5: Solve for x
   x = 39,930,300,324.48/319,890.72
6. Step 6: Final answer
   x = 124,824.82