Finding the Fourth Proportional to 2,620.60, 3,929.88 and 976.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.60 : 3,929.88 = 976.77 : x
2. Step 2: Convert to fraction form
   2,620.60/3,929.88 = 976.77/x
3. Step 3: Cross multiply
   2,620.60x = 3,929.88 × 976.77
4. Step 4: Simplify right side
   2,620.60x = 3,838,588.89
5. Step 5: Solve for x
   x = 3,838,588.89/2,620.60
6. Step 6: Final answer
   x = 1,464.77