Finding the Fourth Proportional to 1,095.34, 1,641.43 and 816.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,095.34 : 1,641.43 = 816.43 : x
2. Step 2: Convert to fraction form
   1,095.34/1,641.43 = 816.43/x
3. Step 3: Cross multiply
   1,095.34x = 1,641.43 × 816.43
4. Step 4: Simplify right side
   1,095.34x = 1,340,112.69
5. Step 5: Solve for x
   x = 1,340,112.69/1,095.34
6. Step 6: Final answer
   x = 1,223.47