Finding the Fourth Proportional to 1,783.98, 2,676.48 and 688.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,783.98 : 2,676.48 = 688.05 : x
2. Step 2: Convert to fraction form
   1,783.98/2,676.48 = 688.05/x
3. Step 3: Cross multiply
   1,783.98x = 2,676.48 × 688.05
4. Step 4: Simplify right side
   1,783.98x = 1,841,552.06
5. Step 5: Solve for x
   x = 1,841,552.06/1,783.98
6. Step 6: Final answer
   x = 1,032.27