Finding the Fourth Proportional to 319,892.72, 479,840.43 and 83,218.31

Step by Step Solution

1. Step 1: Write the proportion equation
   319,892.72 : 479,840.43 = 83,218.31 : x
2. Step 2: Convert to fraction form
   319,892.72/479,840.43 = 83,218.31/x
3. Step 3: Cross multiply
   319,892.72x = 479,840.43 × 83,218.31
4. Step 4: Simplify right side
   319,892.72x = 39,931,509,654.27
5. Step 5: Solve for x
   x = 39,931,509,654.27/319,892.72
6. Step 6: Final answer
   x = 124,827.82