Finding the Fourth Proportional to 1,665.72, 2,298.74 and 919.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.72 : 2,298.74 = 919.73 : x
2. Step 2: Convert to fraction form
   1,665.72/2,298.74 = 919.73/x
3. Step 3: Cross multiply
   1,665.72x = 2,298.74 × 919.73
4. Step 4: Simplify right side
   1,665.72x = 2,114,221.29
5. Step 5: Solve for x
   x = 2,114,221.29/1,665.72
6. Step 6: Final answer
   x = 1,269.25