Finding the Fourth Proportional to 309,770.64, 427,614.48 and 209,304.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,770.64 : 427,614.48 = 209,304.72 : x
2. Step 2: Convert to fraction form
   309,770.64/427,614.48 = 209,304.72/x
3. Step 3: Cross multiply
   309,770.64x = 427,614.48 × 209,304.72
4. Step 4: Simplify right side
   309,770.64x = 89,501,729,004.35
5. Step 5: Solve for x
   x = 89,501,729,004.35/309,770.64
6. Step 6: Final answer
   x = 288,929.03