Finding the Fourth Proportional to 309,369.72, 426,778.38 and 201,890.04

Step by Step Solution

1. Step 1: Write the proportion equation
   309,369.72 : 426,778.38 = 201,890.04 : x
2. Step 2: Convert to fraction form
   309,369.72/426,778.38 = 201,890.04/x
3. Step 3: Cross multiply
   309,369.72x = 426,778.38 × 201,890.04
4. Step 4: Simplify right side
   309,369.72x = 86,162,304,209.34
5. Step 5: Solve for x
   x = 86,162,304,209.34/309,369.72
6. Step 6: Final answer
   x = 278,509.17