Finding the Fourth Proportional to 2,100.15, 2,898.59 and 1,216.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.15 : 2,898.59 = 1,216.44 : x
2. Step 2: Convert to fraction form
   2,100.15/2,898.59 = 1,216.44/x
3. Step 3: Cross multiply
   2,100.15x = 2,898.59 × 1,216.44
4. Step 4: Simplify right side
   2,100.15x = 3,525,954.74
5. Step 5: Solve for x
   x = 3,525,954.74/2,100.15
6. Step 6: Final answer
   x = 1,678.91