Finding the Fourth Proportional to 1,665.40, 2,298.32 and 919.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.40 : 2,298.32 = 919.39 : x
2. Step 2: Convert to fraction form
   1,665.40/2,298.32 = 919.39/x
3. Step 3: Cross multiply
   1,665.40x = 2,298.32 × 919.39
4. Step 4: Simplify right side
   1,665.40x = 2,113,052.42
5. Step 5: Solve for x
   x = 2,113,052.42/1,665.40
6. Step 6: Final answer
   x = 1,268.80