Finding the Fourth Proportional to 1,580.15, 2,180.09 and 881.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,580.15 : 2,180.09 = 881.39 : x
2. Step 2: Convert to fraction form
   1,580.15/2,180.09 = 881.39/x
3. Step 3: Cross multiply
   1,580.15x = 2,180.09 × 881.39
4. Step 4: Simplify right side
   1,580.15x = 1,921,500.83
5. Step 5: Solve for x
   x = 1,921,500.83/1,580.15
6. Step 6: Final answer
   x = 1,216.03