Finding the Fourth Proportional to 1,580.31, 2,180.83 and 881.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.31 : 2,180.83 = 881.69 : x
2. Step 2: Convert to fraction form
   1,580.31/2,180.83 = 881.69/x
3. Step 3: Cross multiply
   1,580.31x = 2,180.83 × 881.69
4. Step 4: Simplify right side
   1,580.31x = 1,922,816.00
5. Step 5: Solve for x
   x = 1,922,816.00/1,580.31
6. Step 6: Final answer
   x = 1,216.73