Finding the Fourth Proportional to 1,207.49, 1,665.06 and 912.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.49 : 1,665.06 = 912.29 : x
2. Step 2: Convert to fraction form
   1,207.49/1,665.06 = 912.29/x
3. Step 3: Cross multiply
   1,207.49x = 1,665.06 × 912.29
4. Step 4: Simplify right side
   1,207.49x = 1,519,017.59
5. Step 5: Solve for x
   x = 1,519,017.59/1,207.49
6. Step 6: Final answer
   x = 1,258.00