Finding the Fourth Proportional to 1,816.38, 2,720.76 and 1,085.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,816.38 : 2,720.76 = 1,085.57 : x
2. Step 2: Convert to fraction form
   1,816.38/2,720.76 = 1,085.57/x
3. Step 3: Cross multiply
   1,816.38x = 2,720.76 × 1,085.57
4. Step 4: Simplify right side
   1,816.38x = 2,953,561.83
5. Step 5: Solve for x
   x = 2,953,561.83/1,816.38
6. Step 6: Final answer
   x = 1,626.07