Finding the Fourth Proportional to 1,311,566.72, 1,967,420.28 and 413,078.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311,566.72 : 1,967,420.28 = 413,078.48 : x
2. Step 2: Convert to fraction form
   1,311,566.72/1,967,420.28 = 413,078.48/x
3. Step 3: Cross multiply
   1,311,566.72x = 1,967,420.28 × 413,078.48
4. Step 4: Simplify right side
   1,311,566.72x = 812,698,978,783.57
5. Step 5: Solve for x
   x = 812,698,978,783.57/1,311,566.72
6. Step 6: Final answer
   x = 619,639.83