Finding the Fourth Proportional to 10,519.48, 15,780.79 and 3,123.07

Step by Step Solution

1. Step 1: Write the proportion equation
   10,519.48 : 15,780.79 = 3,123.07 : x
2. Step 2: Convert to fraction form
   10,519.48/15,780.79 = 3,123.07/x
3. Step 3: Cross multiply
   10,519.48x = 15,780.79 × 3,123.07
4. Step 4: Simplify right side
   10,519.48x = 49,284,432.92
5. Step 5: Solve for x
   x = 49,284,432.92/10,519.48
6. Step 6: Final answer
   x = 4,685.06