Finding the Fourth Proportional to 2,620.44, 3,931.20 and 976.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.44 : 3,931.20 = 976.59 : x
2. Step 2: Convert to fraction form
   2,620.44/3,931.20 = 976.59/x
3. Step 3: Cross multiply
   2,620.44x = 3,931.20 × 976.59
4. Step 4: Simplify right side
   2,620.44x = 3,839,170.61
5. Step 5: Solve for x
   x = 3,839,170.61/2,620.44
6. Step 6: Final answer
   x = 1,465.09