Finding the Fourth Proportional to 1,787.27, 2,678.91 and 690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,787.27 : 2,678.91 = 690.72 : x
2. Step 2: Convert to fraction form
   1,787.27/2,678.91 = 690.72/x
3. Step 3: Cross multiply
   1,787.27x = 2,678.91 × 690.72
4. Step 4: Simplify right side
   1,787.27x = 1,850,376.72
5. Step 5: Solve for x
   x = 1,850,376.72/1,787.27
6. Step 6: Final answer
   x = 1,035.31