Finding the Fourth Proportional to 236,019.12, 353,979.45 and 86,329.89

Step by Step Solution

1. Step 1: Write the proportion equation
   236,019.12 : 353,979.45 = 86,329.89 : x
2. Step 2: Convert to fraction form
   236,019.12/353,979.45 = 86,329.89/x
3. Step 3: Cross multiply
   236,019.12x = 353,979.45 × 86,329.89
4. Step 4: Simplify right side
   236,019.12x = 30,559,006,980.76
5. Step 5: Solve for x
   x = 30,559,006,980.76/236,019.12
6. Step 6: Final answer
   x = 129,476.83