Finding the Fourth Proportional to 1,580.59, 2,179.98 and 1,021.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.59 : 2,179.98 = 1,021.12 : x
2. Step 2: Convert to fraction form
   1,580.59/2,179.98 = 1,021.12/x
3. Step 3: Cross multiply
   1,580.59x = 2,179.98 × 1,021.12
4. Step 4: Simplify right side
   1,580.59x = 2,226,015.73
5. Step 5: Solve for x
   x = 2,226,015.73/1,580.59
6. Step 6: Final answer
   x = 1,408.34