Finding the Fourth Proportional to 1,665.18, 2,297.88 and 919.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.18 : 2,297.88 = 919.17 : x
2. Step 2: Convert to fraction form
   1,665.18/2,297.88 = 919.17/x
3. Step 3: Cross multiply
   1,665.18x = 2,297.88 × 919.17
4. Step 4: Simplify right side
   1,665.18x = 2,112,142.36
5. Step 5: Solve for x
   x = 2,112,142.36/1,665.18
6. Step 6: Final answer
   x = 1,268.42