Finding the Fourth Proportional to 1,581.59, 2,372.42 and 486

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.59 : 2,372.42 = 486 : x
2. Step 2: Convert to fraction form
   1,581.59/2,372.42 = 486/x
3. Step 3: Cross multiply
   1,581.59x = 2,372.42 × 486
4. Step 4: Simplify right side
   1,581.59x = 1,152,997.34
5. Step 5: Solve for x
   x = 1,152,997.34/1,581.59
6. Step 6: Final answer
   x = 729.01