Finding the Fourth Proportional to 1,665.94, 2,298.90 and 919.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.94 : 2,298.90 = 919.78 : x
2. Step 2: Convert to fraction form
   1,665.94/2,298.90 = 919.78/x
3. Step 3: Cross multiply
   1,665.94x = 2,298.90 × 919.78
4. Step 4: Simplify right side
   1,665.94x = 2,114,482.24
5. Step 5: Solve for x
   x = 2,114,482.24/1,665.94
6. Step 6: Final answer
   x = 1,269.24