Finding the Fourth Proportional to 1,580.34, 2,180.89 and 881.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.34 : 2,180.89 = 881.71 : x
2. Step 2: Convert to fraction form
   1,580.34/2,180.89 = 881.71/x
3. Step 3: Cross multiply
   1,580.34x = 2,180.89 × 881.71
4. Step 4: Simplify right side
   1,580.34x = 1,922,912.52
5. Step 5: Solve for x
   x = 1,922,912.52/1,580.34
6. Step 6: Final answer
   x = 1,216.77