Finding the Fourth Proportional to 378,839.89, 522,796.64 and 209,074.03

Step by Step Solution

1. Step 1: Write the proportion equation
   378,839.89 : 522,796.64 = 209,074.03 : x
2. Step 2: Convert to fraction form
   378,839.89/522,796.64 = 209,074.03/x
3. Step 3: Cross multiply
   378,839.89x = 522,796.64 × 209,074.03
4. Step 4: Simplify right side
   378,839.89x = 109,303,199,349.89
5. Step 5: Solve for x
   x = 109,303,199,349.89/378,839.89
6. Step 6: Final answer
   x = 288,520.83