Finding the Fourth Proportional to 1,359.76, 2,040.60 and 812.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.76 : 2,040.60 = 812.56 : x
2. Step 2: Convert to fraction form
   1,359.76/2,040.60 = 812.56/x
3. Step 3: Cross multiply
   1,359.76x = 2,040.60 × 812.56
4. Step 4: Simplify right side
   1,359.76x = 1,658,109.94
5. Step 5: Solve for x
   x = 1,658,109.94/1,359.76
6. Step 6: Final answer
   x = 1,219.41