Finding the Fourth Proportional to 2,620.10, 3,929.78 and 976.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.10 : 3,929.78 = 976.43 : x
2. Step 2: Convert to fraction form
   2,620.10/3,929.78 = 976.43/x
3. Step 3: Cross multiply
   2,620.10x = 3,929.78 × 976.43
4. Step 4: Simplify right side
   2,620.10x = 3,837,130.55
5. Step 5: Solve for x
   x = 3,837,130.55/2,620.10
6. Step 6: Final answer
   x = 1,464.50