Finding the Fourth Proportional to 1,580.09, 2,181.15 and 1,020.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.09 : 2,181.15 = 1,020.60 : x
2. Step 2: Convert to fraction form
   1,580.09/2,181.15 = 1,020.60/x
3. Step 3: Cross multiply
   1,580.09x = 2,181.15 × 1,020.60
4. Step 4: Simplify right side
   1,580.09x = 2,226,081.69
5. Step 5: Solve for x
   x = 2,226,081.69/1,580.09
6. Step 6: Final answer
   x = 1,408.83