Finding the Fourth Proportional to 2,620.69, 3,931.64 and 889.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.69 : 3,931.64 = 889.31 : x
2. Step 2: Convert to fraction form
   2,620.69/3,931.64 = 889.31/x
3. Step 3: Cross multiply
   2,620.69x = 3,931.64 × 889.31
4. Step 4: Simplify right side
   2,620.69x = 3,496,455.49
5. Step 5: Solve for x
   x = 3,496,455.49/2,620.69
6. Step 6: Final answer
   x = 1,334.17