Finding the Fourth Proportional to 275,665, 380,389.35 and 154,805.31

Step by Step Solution

1. Step 1: Write the proportion equation
   275,665 : 380,389.35 = 154,805.31 : x
2. Step 2: Convert to fraction form
   275,665/380,389.35 = 154,805.31/x
3. Step 3: Cross multiply
   275,665x = 380,389.35 × 154,805.31
4. Step 4: Simplify right side
   275,665x = 58,886,288,571.48
5. Step 5: Solve for x
   x = 58,886,288,571.48/275,665
6. Step 6: Final answer
   x = 213,615.40