Finding the Fourth Proportional to 431,689.37, 647,164.71 and 165,640.82

Step by Step Solution

1. Step 1: Write the proportion equation
   431,689.37 : 647,164.71 = 165,640.82 : x
2. Step 2: Convert to fraction form
   431,689.37/647,164.71 = 165,640.82/x
3. Step 3: Cross multiply
   431,689.37x = 647,164.71 × 165,640.82
4. Step 4: Simplify right side
   431,689.37x = 107,196,890,003.64
5. Step 5: Solve for x
   x = 107,196,890,003.64/431,689.37
6. Step 6: Final answer
   x = 248,319.51