Finding the Fourth Proportional to 3,870.70, 5,801.91 and 1,788.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.70 : 5,801.91 = 1,788.28 : x
2. Step 2: Convert to fraction form
   3,870.70/5,801.91 = 1,788.28/x
3. Step 3: Cross multiply
   3,870.70x = 5,801.91 × 1,788.28
4. Step 4: Simplify right side
   3,870.70x = 10,375,439.61
5. Step 5: Solve for x
   x = 10,375,439.61/3,870.70
6. Step 6: Final answer
   x = 2,680.51