Finding the Fourth Proportional to 1,580.30, 2,370.69 and 1,287.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.30 : 2,370.69 = 1,287.10 : x
2. Step 2: Convert to fraction form
   1,580.30/2,370.69 = 1,287.10/x
3. Step 3: Cross multiply
   1,580.30x = 2,370.69 × 1,287.10
4. Step 4: Simplify right side
   1,580.30x = 3,051,309.17
5. Step 5: Solve for x
   x = 3,051,309.17/1,580.30
6. Step 6: Final answer
   x = 1,930.85