Finding the Fourth Proportional to 322,499.14, 483,748.71 and 266,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   322,499.14 : 483,748.71 = 266,978.50 : x
2. Step 2: Convert to fraction form
   322,499.14/483,748.71 = 266,978.50/x
3. Step 3: Cross multiply
   322,499.14x = 483,748.71 × 266,978.50
4. Step 4: Simplify right side
   322,499.14x = 129,150,504,972.74
5. Step 5: Solve for x
   x = 129,150,504,972.74/322,499.14
6. Step 6: Final answer
   x = 400,467.75