Finding the Fourth Proportional to 1,676.35, 2,315.62 and 1,288.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,676.35 : 2,315.62 = 1,288.23 : x
2. Step 2: Convert to fraction form
   1,676.35/2,315.62 = 1,288.23/x
3. Step 3: Cross multiply
   1,676.35x = 2,315.62 × 1,288.23
4. Step 4: Simplify right side
   1,676.35x = 2,983,051.15
5. Step 5: Solve for x
   x = 2,983,051.15/1,676.35
6. Step 6: Final answer
   x = 1,779.49