Finding the Fourth Proportional to 1,665.35, 2,298.19 and 919.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.35 : 2,298.19 = 919.31 : x
2. Step 2: Convert to fraction form
   1,665.35/2,298.19 = 919.31/x
3. Step 3: Cross multiply
   1,665.35x = 2,298.19 × 919.31
4. Step 4: Simplify right side
   1,665.35x = 2,112,749.05
5. Step 5: Solve for x
   x = 2,112,749.05/1,665.35
6. Step 6: Final answer
   x = 1,268.65