Finding the Fourth Proportional to 1,215.01, 1,676.86 and 684.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.01 : 1,676.86 = 684.09 : x
2. Step 2: Convert to fraction form
   1,215.01/1,676.86 = 684.09/x
3. Step 3: Cross multiply
   1,215.01x = 1,676.86 × 684.09
4. Step 4: Simplify right side
   1,215.01x = 1,147,121.45
5. Step 5: Solve for x
   x = 1,147,121.45/1,215.01
6. Step 6: Final answer
   x = 944.13