Finding the Fourth Proportional to 1,976.60, 2,962.78 and 879.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,976.60 : 2,962.78 = 879.46 : x
2. Step 2: Convert to fraction form
   1,976.60/2,962.78 = 879.46/x
3. Step 3: Cross multiply
   1,976.60x = 2,962.78 × 879.46
4. Step 4: Simplify right side
   1,976.60x = 2,605,636.89
5. Step 5: Solve for x
   x = 2,605,636.89/1,976.60
6. Step 6: Final answer
   x = 1,318.24