Finding the Fourth Proportional to 1,391,974.56, 1,921,059.72 and 780,231.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,974.56 : 1,921,059.72 = 780,231.24 : x
2. Step 2: Convert to fraction form
   1,391,974.56/1,921,059.72 = 780,231.24/x
3. Step 3: Cross multiply
   1,391,974.56x = 1,921,059.72 × 780,231.24
4. Step 4: Simplify right side
   1,391,974.56x = 1,498,870,807,449.65
5. Step 5: Solve for x
   x = 1,498,870,807,449.65/1,391,974.56
6. Step 6: Final answer
   x = 1,076,794.68