Finding the Fourth Proportional to 309,758.72, 427,597.52 and 209,292.80

Step by Step Solution

1. Step 1: Write the proportion equation
   309,758.72 : 427,597.52 = 209,292.80 : x
2. Step 2: Convert to fraction form
   309,758.72/427,597.52 = 209,292.80/x
3. Step 3: Cross multiply
   309,758.72x = 427,597.52 × 209,292.80
4. Step 4: Simplify right side
   309,758.72x = 89,493,082,233.86
5. Step 5: Solve for x
   x = 89,493,082,233.86/309,758.72
6. Step 6: Final answer
   x = 288,912.23