Finding the Fourth Proportional to 2,617,642.56, 3,926,349.60 and 820,485

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617,642.56 : 3,926,349.60 = 820,485 : x
2. Step 2: Convert to fraction form
   2,617,642.56/3,926,349.60 = 820,485/x
3. Step 3: Cross multiply
   2,617,642.56x = 3,926,349.60 × 820,485
4. Step 4: Simplify right side
   2,617,642.56x = 3,221,510,951,556
5. Step 5: Solve for x
   x = 3,221,510,951,556/2,617,642.56
6. Step 6: Final answer
   x = 1,230,691.69