Finding the Fourth Proportional to 2,139.89, 2,951.78 and 1,299.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.89 : 2,951.78 = 1,299.92 : x
2. Step 2: Convert to fraction form
   2,139.89/2,951.78 = 1,299.92/x
3. Step 3: Cross multiply
   2,139.89x = 2,951.78 × 1,299.92
4. Step 4: Simplify right side
   2,139.89x = 3,837,056.60
5. Step 5: Solve for x
   x = 3,837,056.60/2,139.89
6. Step 6: Final answer
   x = 1,793.11