Finding the Fourth Proportional to 3,871.98, 5,802.69 and 1,787.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.98 : 5,802.69 = 1,787.40 : x
2. Step 2: Convert to fraction form
   3,871.98/5,802.69 = 1,787.40/x
3. Step 3: Cross multiply
   3,871.98x = 5,802.69 × 1,787.40
4. Step 4: Simplify right side
   3,871.98x = 10,371,728.11
5. Step 5: Solve for x
   x = 10,371,728.11/3,871.98
6. Step 6: Final answer
   x = 2,678.66