Finding the Fourth Proportional to 1,647.96, 2,469.78 and 1,213.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.96 : 2,469.78 = 1,213.08 : x
2. Step 2: Convert to fraction form
   1,647.96/2,469.78 = 1,213.08/x
3. Step 3: Cross multiply
   1,647.96x = 2,469.78 × 1,213.08
4. Step 4: Simplify right side
   1,647.96x = 2,996,040.72
5. Step 5: Solve for x
   x = 2,996,040.72/1,647.96
6. Step 6: Final answer
   x = 1,818.03