Finding the Fourth Proportional to 2,100.24, 2,898.11 and 1,215.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.24 : 2,898.11 = 1,215.88 : x
2. Step 2: Convert to fraction form
   2,100.24/2,898.11 = 1,215.88/x
3. Step 3: Cross multiply
   2,100.24x = 2,898.11 × 1,215.88
4. Step 4: Simplify right side
   2,100.24x = 3,523,749.78
5. Step 5: Solve for x
   x = 3,523,749.78/2,100.24
6. Step 6: Final answer
   x = 1,677.78