Finding the Fourth Proportional to 2,102.72, 3,153.52 and 1,278.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,102.72 : 3,153.52 = 1,278.14 : x
2. Step 2: Convert to fraction form
   2,102.72/3,153.52 = 1,278.14/x
3. Step 3: Cross multiply
   2,102.72x = 3,153.52 × 1,278.14
4. Step 4: Simplify right side
   2,102.72x = 4,030,640.05
5. Step 5: Solve for x
   x = 4,030,640.05/2,102.72
6. Step 6: Final answer
   x = 1,916.87