Finding the Fourth Proportional to 1,665.90, 2,299.01 and 919.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.90 : 2,299.01 = 919.89 : x
2. Step 2: Convert to fraction form
   1,665.90/2,299.01 = 919.89/x
3. Step 3: Cross multiply
   1,665.90x = 2,299.01 × 919.89
4. Step 4: Simplify right side
   1,665.90x = 2,114,831.71
5. Step 5: Solve for x
   x = 2,114,831.71/1,665.90
6. Step 6: Final answer
   x = 1,269.48