Finding the Fourth Proportional to 1,076,581.78, 1,615,188.42 and 318,443.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076,581.78 : 1,615,188.42 = 318,443.20 : x
2. Step 2: Convert to fraction form
   1,076,581.78/1,615,188.42 = 318,443.20/x
3. Step 3: Cross multiply
   1,076,581.78x = 1,615,188.42 × 318,443.20
4. Step 4: Simplify right side
   1,076,581.78x = 514,345,760,991.80
5. Step 5: Solve for x
   x = 514,345,760,991.80/1,076,581.78
6. Step 6: Final answer
   x = 477,758.19