Finding the Fourth Proportional to 1,665.40, 2,298.20 and 919.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.40 : 2,298.20 = 919.32 : x
2. Step 2: Convert to fraction form
   1,665.40/2,298.20 = 919.32/x
3. Step 3: Cross multiply
   1,665.40x = 2,298.20 × 919.32
4. Step 4: Simplify right side
   1,665.40x = 2,112,781.22
5. Step 5: Solve for x
   x = 2,112,781.22/1,665.40
6. Step 6: Final answer
   x = 1,268.63