Finding the Fourth Proportional to 339,308.69, 508,962.69 and 86,589.18

Step by Step Solution

1. Step 1: Write the proportion equation
   339,308.69 : 508,962.69 = 86,589.18 : x
2. Step 2: Convert to fraction form
   339,308.69/508,962.69 = 86,589.18/x
3. Step 3: Cross multiply
   339,308.69x = 508,962.69 × 86,589.18
4. Step 4: Simplify right side
   339,308.69x = 44,070,661,977.69
5. Step 5: Solve for x
   x = 44,070,661,977.69/339,308.69
6. Step 6: Final answer
   x = 129,883.68