Finding the Fourth Proportional to 360,308.72, 497,256.72 and 209,396

Step by Step Solution

1. Step 1: Write the proportion equation
   360,308.72 : 497,256.72 = 209,396 : x
2. Step 2: Convert to fraction form
   360,308.72/497,256.72 = 209,396/x
3. Step 3: Cross multiply
   360,308.72x = 497,256.72 × 209,396
4. Step 4: Simplify right side
   360,308.72x = 104,123,568,141.12
5. Step 5: Solve for x
   x = 104,123,568,141.12/360,308.72
6. Step 6: Final answer
   x = 288,984.31