Finding the Fourth Proportional to 2,265.30, 3,398.82 and 879.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,265.30 : 3,398.82 = 879.61 : x
2. Step 2: Convert to fraction form
   2,265.30/3,398.82 = 879.61/x
3. Step 3: Cross multiply
   2,265.30x = 3,398.82 × 879.61
4. Step 4: Simplify right side
   2,265.30x = 2,989,642.43
5. Step 5: Solve for x
   x = 2,989,642.43/2,265.30
6. Step 6: Final answer
   x = 1,319.75