Finding the Fourth Proportional to 806,104.37, 1,209,914.12 and 422,128.82

Step by Step Solution

1. Step 1: Write the proportion equation
   806,104.37 : 1,209,914.12 = 422,128.82 : x
2. Step 2: Convert to fraction form
   806,104.37/1,209,914.12 = 422,128.82/x
3. Step 3: Cross multiply
   806,104.37x = 1,209,914.12 × 422,128.82
4. Step 4: Simplify right side
   806,104.37x = 510,739,619,776.94
5. Step 5: Solve for x
   x = 510,739,619,776.94/806,104.37
6. Step 6: Final answer
   x = 633,589.94