Finding the Fourth Proportional to 1,665.72, 2,298.68 and 919.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.72 : 2,298.68 = 919.69 : x
2. Step 2: Convert to fraction form
   1,665.72/2,298.68 = 919.69/x
3. Step 3: Cross multiply
   1,665.72x = 2,298.68 × 919.69
4. Step 4: Simplify right side
   1,665.72x = 2,114,079.04
5. Step 5: Solve for x
   x = 2,114,079.04/1,665.72
6. Step 6: Final answer
   x = 1,269.17