Finding the Fourth Proportional to 408,128.34, 609,106.25 and 397,499.52

Step by Step Solution

1. Step 1: Write the proportion equation
   408,128.34 : 609,106.25 = 397,499.52 : x
2. Step 2: Convert to fraction form
   408,128.34/609,106.25 = 397,499.52/x
3. Step 3: Cross multiply
   408,128.34x = 609,106.25 × 397,499.52
4. Step 4: Simplify right side
   408,128.34x = 242,119,440,016.50
5. Step 5: Solve for x
   x = 242,119,440,016.50/408,128.34
6. Step 6: Final answer
   x = 593,243.39