Finding the Fourth Proportional to 339,436.89, 509,155.32 and 86,717.91

Step by Step Solution

1. Step 1: Write the proportion equation
   339,436.89 : 509,155.32 = 86,717.91 : x
2. Step 2: Convert to fraction form
   339,436.89/509,155.32 = 86,717.91/x
3. Step 3: Cross multiply
   339,436.89x = 509,155.32 × 86,717.91
4. Step 4: Simplify right side
   339,436.89x = 44,152,885,215.78
5. Step 5: Solve for x
   x = 44,152,885,215.78/339,436.89
6. Step 6: Final answer
   x = 130,076.86