Finding the Fourth Proportional to 1,340.40, 1,849.72 and 816.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.40 : 1,849.72 = 816.56 : x
2. Step 2: Convert to fraction form
   1,340.40/1,849.72 = 816.56/x
3. Step 3: Cross multiply
   1,340.40x = 1,849.72 × 816.56
4. Step 4: Simplify right side
   1,340.40x = 1,510,407.36
5. Step 5: Solve for x
   x = 1,510,407.36/1,340.40
6. Step 6: Final answer
   x = 1,126.83