Finding the Fourth Proportional to 2,100.18, 3,144.60 and 1,276.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.18 : 3,144.60 = 1,276.80 : x
2. Step 2: Convert to fraction form
   2,100.18/3,144.60 = 1,276.80/x
3. Step 3: Cross multiply
   2,100.18x = 3,144.60 × 1,276.80
4. Step 4: Simplify right side
   2,100.18x = 4,015,025.28
5. Step 5: Solve for x
   x = 4,015,025.28/2,100.18
6. Step 6: Final answer
   x = 1,911.75