Finding the Fourth Proportional to 1,581.86, 2,360.59 and 1,389.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.86 : 2,360.59 = 1,389.88 : x
2. Step 2: Convert to fraction form
   1,581.86/2,360.59 = 1,389.88/x
3. Step 3: Cross multiply
   1,581.86x = 2,360.59 × 1,389.88
4. Step 4: Simplify right side
   1,581.86x = 3,280,936.83
5. Step 5: Solve for x
   x = 3,280,936.83/1,581.86
6. Step 6: Final answer
   x = 2,074.10