Finding the Fourth Proportional to 1,581.76, 2,371.83 and 485.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.76 : 2,371.83 = 485.83 : x
2. Step 2: Convert to fraction form
   1,581.76/2,371.83 = 485.83/x
3. Step 3: Cross multiply
   1,581.76x = 2,371.83 × 485.83
4. Step 4: Simplify right side
   1,581.76x = 1,152,306.17
5. Step 5: Solve for x
   x = 1,152,306.17/1,581.76
6. Step 6: Final answer
   x = 728.50