Finding the Fourth Proportional to 2,100.29, 2,898.23 and 1,216.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.29 : 2,898.23 = 1,216.15 : x
2. Step 2: Convert to fraction form
   2,100.29/2,898.23 = 1,216.15/x
3. Step 3: Cross multiply
   2,100.29x = 2,898.23 × 1,216.15
4. Step 4: Simplify right side
   2,100.29x = 3,524,672.13
5. Step 5: Solve for x
   x = 3,524,672.13/2,100.29
6. Step 6: Final answer
   x = 1,678.19