Finding the Fourth Proportional to 2,100.02, 2,898.09 and 1,215.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.02 : 2,898.09 = 1,215.89 : x
2. Step 2: Convert to fraction form
   2,100.02/2,898.09 = 1,215.89/x
3. Step 3: Cross multiply
   2,100.02x = 2,898.09 × 1,215.89
4. Step 4: Simplify right side
   2,100.02x = 3,523,758.65
5. Step 5: Solve for x
   x = 3,523,758.65/2,100.02
6. Step 6: Final answer
   x = 1,677.96