Finding the Fourth Proportional to 10,519.30, 15,776.52 and 3,121.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,519.30 : 15,776.52 = 3,121.98 : x
2. Step 2: Convert to fraction form
   10,519.30/15,776.52 = 3,121.98/x
3. Step 3: Cross multiply
   10,519.30x = 15,776.52 × 3,121.98
4. Step 4: Simplify right side
   10,519.30x = 49,253,979.91
5. Step 5: Solve for x
   x = 49,253,979.91/10,519.30
6. Step 6: Final answer
   x = 4,682.25