Finding the Fourth Proportional to 1,579.83, 2,178.12 and 1,019.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,579.83 : 2,178.12 = 1,019.31 : x
2. Step 2: Convert to fraction form
   1,579.83/2,178.12 = 1,019.31/x
3. Step 3: Cross multiply
   1,579.83x = 2,178.12 × 1,019.31
4. Step 4: Simplify right side
   1,579.83x = 2,220,179.50
5. Step 5: Solve for x
   x = 2,220,179.50/1,579.83
6. Step 6: Final answer
   x = 1,405.33