Finding the Fourth Proportional to 2,100.79, 2,898.92 and 1,216.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.79 : 2,898.92 = 1,216.42 : x
2. Step 2: Convert to fraction form
   2,100.79/2,898.92 = 1,216.42/x
3. Step 3: Cross multiply
   2,100.79x = 2,898.92 × 1,216.42
4. Step 4: Simplify right side
   2,100.79x = 3,526,304.27
5. Step 5: Solve for x
   x = 3,526,304.27/2,100.79
6. Step 6: Final answer
   x = 1,678.56