Finding the Fourth Proportional to 309,758.64, 427,597.68 and 209,292.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,758.64 : 427,597.68 = 209,292.72 : x
2. Step 2: Convert to fraction form
   309,758.64/427,597.68 = 209,292.72/x
3. Step 3: Cross multiply
   309,758.64x = 427,597.68 × 209,292.72
4. Step 4: Simplify right side
   309,758.64x = 89,493,081,512.89
5. Step 5: Solve for x
   x = 89,493,081,512.89/309,758.64
6. Step 6: Final answer
   x = 288,912.30