Finding the Fourth Proportional to 2,100.07, 2,898.39 and 1,216.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.07 : 2,898.39 = 1,216.18 : x
2. Step 2: Convert to fraction form
   2,100.07/2,898.39 = 1,216.18/x
3. Step 3: Cross multiply
   2,100.07x = 2,898.39 × 1,216.18
4. Step 4: Simplify right side
   2,100.07x = 3,524,963.95
5. Step 5: Solve for x
   x = 3,524,963.95/2,100.07
6. Step 6: Final answer
   x = 1,678.50