Finding the Fourth Proportional to 2,123.61, 3,179.25 and 1,299.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.61 : 3,179.25 = 1,299.36 : x
2. Step 2: Convert to fraction form
   2,123.61/3,179.25 = 1,299.36/x
3. Step 3: Cross multiply
   2,123.61x = 3,179.25 × 1,299.36
4. Step 4: Simplify right side
   2,123.61x = 4,131,002.20
5. Step 5: Solve for x
   x = 4,131,002.20/2,123.61
6. Step 6: Final answer
   x = 1,945.28