Finding the Fourth Proportional to 1,667.99, 2,301.83 and 911.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.99 : 2,301.83 = 911.78 : x
2. Step 2: Convert to fraction form
   1,667.99/2,301.83 = 911.78/x
3. Step 3: Cross multiply
   1,667.99x = 2,301.83 × 911.78
4. Step 4: Simplify right side
   1,667.99x = 2,098,767.17
5. Step 5: Solve for x
   x = 2,098,767.17/1,667.99
6. Step 6: Final answer
   x = 1,258.27