Finding the Fourth Proportional to 1,441.74, 1,989.56 and 917.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.74 : 1,989.56 = 917.76 : x
2. Step 2: Convert to fraction form
   1,441.74/1,989.56 = 917.76/x
3. Step 3: Cross multiply
   1,441.74x = 1,989.56 × 917.76
4. Step 4: Simplify right side
   1,441.74x = 1,825,938.59
5. Step 5: Solve for x
   x = 1,825,938.59/1,441.74
6. Step 6: Final answer
   x = 1,266.48