Finding the Fourth Proportional to 1,669.40, 2,303.72 and 923.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,669.40 : 2,303.72 = 923.31 : x
2. Step 2: Convert to fraction form
   1,669.40/2,303.72 = 923.31/x
3. Step 3: Cross multiply
   1,669.40x = 2,303.72 × 923.31
4. Step 4: Simplify right side
   1,669.40x = 2,127,043.10
5. Step 5: Solve for x
   x = 2,127,043.10/1,669.40
6. Step 6: Final answer
   x = 1,274.14