Finding the Fourth Proportional to 2,100.52, 2,898.40 and 1,216.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.52 : 2,898.40 = 1,216.15 : x
2. Step 2: Convert to fraction form
   2,100.52/2,898.40 = 1,216.15/x
3. Step 3: Cross multiply
   2,100.52x = 2,898.40 × 1,216.15
4. Step 4: Simplify right side
   2,100.52x = 3,524,889.16
5. Step 5: Solve for x
   x = 3,524,889.16/2,100.52
6. Step 6: Final answer
   x = 1,678.10