Finding the Fourth Proportional to 1,870.48, 2,578.80 and 1,345.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.48 : 2,578.80 = 1,345.60 : x
2. Step 2: Convert to fraction form
   1,870.48/2,578.80 = 1,345.60/x
3. Step 3: Cross multiply
   1,870.48x = 2,578.80 × 1,345.60
4. Step 4: Simplify right side
   1,870.48x = 3,470,033.28
5. Step 5: Solve for x
   x = 3,470,033.28/1,870.48
6. Step 6: Final answer
   x = 1,855.16