Finding the Fourth Proportional to 1,580.52, 2,180.61 and 881.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.52 : 2,180.61 = 881.76 : x
2. Step 2: Convert to fraction form
   1,580.52/2,180.61 = 881.76/x
3. Step 3: Cross multiply
   1,580.52x = 2,180.61 × 881.76
4. Step 4: Simplify right side
   1,580.52x = 1,922,774.67
5. Step 5: Solve for x
   x = 1,922,774.67/1,580.52
6. Step 6: Final answer
   x = 1,216.55