Finding the Fourth Proportional to 1,441.76, 1,989.05 and 910.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.76 : 1,989.05 = 910.51 : x
2. Step 2: Convert to fraction form
   1,441.76/1,989.05 = 910.51/x
3. Step 3: Cross multiply
   1,441.76x = 1,989.05 × 910.51
4. Step 4: Simplify right side
   1,441.76x = 1,811,040.39
5. Step 5: Solve for x
   x = 1,811,040.39/1,441.76
6. Step 6: Final answer
   x = 1,256.14