Finding the Fourth Proportional to 2,620.47, 3,930.96 and 976.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.47 : 3,930.96 = 976.63 : x
2. Step 2: Convert to fraction form
   2,620.47/3,930.96 = 976.63/x
3. Step 3: Cross multiply
   2,620.47x = 3,930.96 × 976.63
4. Step 4: Simplify right side
   2,620.47x = 3,839,111.25
5. Step 5: Solve for x
   x = 3,839,111.25/2,620.47
6. Step 6: Final answer
   x = 1,465.05