Finding the Fourth Proportional to 1,665.68, 2,298.73 and 919.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.68 : 2,298.73 = 919.64 : x
2. Step 2: Convert to fraction form
   1,665.68/2,298.73 = 919.64/x
3. Step 3: Cross multiply
   1,665.68x = 2,298.73 × 919.64
4. Step 4: Simplify right side
   1,665.68x = 2,113,996.30
5. Step 5: Solve for x
   x = 2,113,996.30/1,665.68
6. Step 6: Final answer
   x = 1,269.15