Finding the Fourth Proportional to 2,100.97, 2,898.89 and 1,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.97 : 2,898.89 = 1,216.72 : x
2. Step 2: Convert to fraction form
   2,100.97/2,898.89 = 1,216.72/x
3. Step 3: Cross multiply
   2,100.97x = 2,898.89 × 1,216.72
4. Step 4: Simplify right side
   2,100.97x = 3,527,125.99
5. Step 5: Solve for x
   x = 3,527,125.99/2,100.97
6. Step 6: Final answer
   x = 1,678.81