Finding the Fourth Proportional to 1,383.59, 1,910.62 and 879.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.59 : 1,910.62 = 879.61 : x
2. Step 2: Convert to fraction form
   1,383.59/1,910.62 = 879.61/x
3. Step 3: Cross multiply
   1,383.59x = 1,910.62 × 879.61
4. Step 4: Simplify right side
   1,383.59x = 1,680,600.46
5. Step 5: Solve for x
   x = 1,680,600.46/1,383.59
6. Step 6: Final answer
   x = 1,214.67