Finding the Fourth Proportional to 1,512.89, 2,087.69 and 923.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,512.89 : 2,087.69 = 923.30 : x
2. Step 2: Convert to fraction form
   1,512.89/2,087.69 = 923.30/x
3. Step 3: Cross multiply
   1,512.89x = 2,087.69 × 923.30
4. Step 4: Simplify right side
   1,512.89x = 1,927,549.12
5. Step 5: Solve for x
   x = 1,927,549.12/1,512.89
6. Step 6: Final answer
   x = 1,274.09