Finding the Fourth Proportional to 1,870.40, 2,578.56 and 1,344.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.40 : 2,578.56 = 1,344.80 : x
2. Step 2: Convert to fraction form
   1,870.40/2,578.56 = 1,344.80/x
3. Step 3: Cross multiply
   1,870.40x = 2,578.56 × 1,344.80
4. Step 4: Simplify right side
   1,870.40x = 3,467,647.49
5. Step 5: Solve for x
   x = 3,467,647.49/1,870.40
6. Step 6: Final answer
   x = 1,853.96