Finding the Fourth Proportional to 1,665.39, 2,298.20 and 919.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.39 : 2,298.20 = 919.30 : x
2. Step 2: Convert to fraction form
   1,665.39/2,298.20 = 919.30/x
3. Step 3: Cross multiply
   1,665.39x = 2,298.20 × 919.30
4. Step 4: Simplify right side
   1,665.39x = 2,112,735.26
5. Step 5: Solve for x
   x = 2,112,735.26/1,665.39
6. Step 6: Final answer
   x = 1,268.61