Finding the Fourth Proportional to 323,279.09, 484,918.31 and 86,615.31

Step by Step Solution

1. Step 1: Write the proportion equation
   323,279.09 : 484,918.31 = 86,615.31 : x
2. Step 2: Convert to fraction form
   323,279.09/484,918.31 = 86,615.31/x
3. Step 3: Cross multiply
   323,279.09x = 484,918.31 × 86,615.31
4. Step 4: Simplify right side
   323,279.09x = 42,001,349,745.33
5. Step 5: Solve for x
   x = 42,001,349,745.33/323,279.09
6. Step 6: Final answer
   x = 129,922.88