Finding the Fourth Proportional to 1,783.89, 2,675.43 and 687.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,783.89 : 2,675.43 = 687.96 : x
2. Step 2: Convert to fraction form
   1,783.89/2,675.43 = 687.96/x
3. Step 3: Cross multiply
   1,783.89x = 2,675.43 × 687.96
4. Step 4: Simplify right side
   1,783.89x = 1,840,588.82
5. Step 5: Solve for x
   x = 1,840,588.82/1,783.89
6. Step 6: Final answer
   x = 1,031.78