Finding the Fourth Proportional to 1,581.50, 2,182.47 and 1,058.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.50 : 2,182.47 = 1,058.78 : x
2. Step 2: Convert to fraction form
   1,581.50/2,182.47 = 1,058.78/x
3. Step 3: Cross multiply
   1,581.50x = 2,182.47 × 1,058.78
4. Step 4: Simplify right side
   1,581.50x = 2,310,755.59
5. Step 5: Solve for x
   x = 2,310,755.59/1,581.50
6. Step 6: Final answer
   x = 1,461.12