Finding the Fourth Proportional to 1,821.86, 2,728.67 and 1,276.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,821.86 : 2,728.67 = 1,276.47 : x
2. Step 2: Convert to fraction form
   1,821.86/2,728.67 = 1,276.47/x
3. Step 3: Cross multiply
   1,821.86x = 2,728.67 × 1,276.47
4. Step 4: Simplify right side
   1,821.86x = 3,483,077.46
5. Step 5: Solve for x
   x = 3,483,077.46/1,821.86
6. Step 6: Final answer
   x = 1,911.83