Finding the Fourth Proportional to 1,276.50, 1,916.38 and 1,085.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.50 : 1,916.38 = 1,085.34 : x
2. Step 2: Convert to fraction form
   1,276.50/1,916.38 = 1,085.34/x
3. Step 3: Cross multiply
   1,276.50x = 1,916.38 × 1,085.34
4. Step 4: Simplify right side
   1,276.50x = 2,079,923.87
5. Step 5: Solve for x
   x = 2,079,923.87/1,276.50
6. Step 6: Final answer
   x = 1,629.40