Finding the Fourth Proportional to 800,978.59, 1,201,647.75 and 268,485.94

Step by Step Solution

1. Step 1: Write the proportion equation
   800,978.59 : 1,201,647.75 = 268,485.94 : x
2. Step 2: Convert to fraction form
   800,978.59/1,201,647.75 = 268,485.94/x
3. Step 3: Cross multiply
   800,978.59x = 1,201,647.75 × 268,485.94
4. Step 4: Simplify right side
   800,978.59x = 322,625,525,707.64
5. Step 5: Solve for x
   x = 322,625,525,707.64/800,978.59
6. Step 6: Final answer
   x = 402,789.20