Finding the Fourth Proportional to 827,587.88, 1,234,139.60 and 820,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   827,587.88 : 1,234,139.60 = 820,020.72 : x
2. Step 2: Convert to fraction form
   827,587.88/1,234,139.60 = 820,020.72/x
3. Step 3: Cross multiply
   827,587.88x = 1,234,139.60 × 820,020.72
4. Step 4: Simplify right side
   827,587.88x = 1,012,020,039,272.41
5. Step 5: Solve for x
   x = 1,012,020,039,272.41/827,587.88
6. Step 6: Final answer
   x = 1,222,855.08