Finding the Fourth Proportional to 1,435.64, 1,981.16 and 911.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.64 : 1,981.16 = 911.96 : x
2. Step 2: Convert to fraction form
   1,435.64/1,981.16 = 911.96/x
3. Step 3: Cross multiply
   1,435.64x = 1,981.16 × 911.96
4. Step 4: Simplify right side
   1,435.64x = 1,806,738.67
5. Step 5: Solve for x
   x = 1,806,738.67/1,435.64
6. Step 6: Final answer
   x = 1,258.49