Finding the Fourth Proportional to 1,276.89, 1,913.71 and 1,103.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.89 : 1,913.71 = 1,103.55 : x
2. Step 2: Convert to fraction form
   1,276.89/1,913.71 = 1,103.55/x
3. Step 3: Cross multiply
   1,276.89x = 1,913.71 × 1,103.55
4. Step 4: Simplify right side
   1,276.89x = 2,111,874.67
5. Step 5: Solve for x
   x = 2,111,874.67/1,276.89
6. Step 6: Final answer
   x = 1,653.92