Finding the Fourth Proportional to 581,608.40, 816,118 and 581,608.40

Step by Step Solution

1. Step 1: Write the proportion equation
   581,608.40 : 816,118 = 581,608.40 : x
2. Step 2: Convert to fraction form
   581,608.40/816,118 = 581,608.40/x
3. Step 3: Cross multiply
   581,608.40x = 816,118 × 581,608.40
4. Step 4: Simplify right side
   581,608.40x = 474,661,084,191.20
5. Step 5: Solve for x
   x = 474,661,084,191.20/581,608.40
6. Step 6: Final answer
   x = 816,118