Finding the Fourth Proportional to 1,870.43, 2,580.89 and 1,310.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.43 : 2,580.89 = 1,310.72 : x
2. Step 2: Convert to fraction form
   1,870.43/2,580.89 = 1,310.72/x
3. Step 3: Cross multiply
   1,870.43x = 2,580.89 × 1,310.72
4. Step 4: Simplify right side
   1,870.43x = 3,382,804.68
5. Step 5: Solve for x
   x = 3,382,804.68/1,870.43
6. Step 6: Final answer
   x = 1,808.58