Finding the Fourth Proportional to 1,340.64, 1,849.89 and 816.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.64 : 1,849.89 = 816.57 : x
2. Step 2: Convert to fraction form
   1,340.64/1,849.89 = 816.57/x
3. Step 3: Cross multiply
   1,340.64x = 1,849.89 × 816.57
4. Step 4: Simplify right side
   1,340.64x = 1,510,564.68
5. Step 5: Solve for x
   x = 1,510,564.68/1,340.64
6. Step 6: Final answer
   x = 1,126.75