Finding the Fourth Proportional to 606,404.10, 850,209.90 and 606,404.10

Step by Step Solution

1. Step 1: Write the proportion equation
   606,404.10 : 850,209.90 = 606,404.10 : x
2. Step 2: Convert to fraction form
   606,404.10/850,209.90 = 606,404.10/x
3. Step 3: Cross multiply
   606,404.10x = 850,209.90 × 606,404.10
4. Step 4: Simplify right side
   606,404.10x = 515,570,769,220.59
5. Step 5: Solve for x
   x = 515,570,769,220.59/606,404.10
6. Step 6: Final answer
   x = 850,209.90