Finding the Fourth Proportional to 2,312.89, 3,469.91 and 669.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.89 : 3,469.91 = 669.42 : x
2. Step 2: Convert to fraction form
   2,312.89/3,469.91 = 669.42/x
3. Step 3: Cross multiply
   2,312.89x = 3,469.91 × 669.42
4. Step 4: Simplify right side
   2,312.89x = 2,322,827.15
5. Step 5: Solve for x
   x = 2,322,827.15/2,312.89
6. Step 6: Final answer
   x = 1,004.30