Finding the Fourth Proportional to 309,279.04, 426,511.20 and 201,814.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,279.04 : 426,511.20 = 201,814.72 : x
2. Step 2: Convert to fraction form
   309,279.04/426,511.20 = 201,814.72/x
3. Step 3: Cross multiply
   309,279.04x = 426,511.20 × 201,814.72
4. Step 4: Simplify right side
   309,279.04x = 86,076,238,404.86
5. Step 5: Solve for x
   x = 86,076,238,404.86/309,279.04
6. Step 6: Final answer
   x = 278,312.55