Finding the Fourth Proportional to 10,519.63, 15,780.29 and 3,499.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,519.63 : 15,780.29 = 3,499.39 : x
2. Step 2: Convert to fraction form
   10,519.63/15,780.29 = 3,499.39/x
3. Step 3: Cross multiply
   10,519.63x = 15,780.29 × 3,499.39
4. Step 4: Simplify right side
   10,519.63x = 55,221,389.02
5. Step 5: Solve for x
   x = 55,221,389.02/10,519.63
6. Step 6: Final answer
   x = 5,249.37