Finding the Fourth Proportional to 10,425.78, 14,386.99 and 5,709.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,425.78 : 14,386.99 = 5,709.15 : x
2. Step 2: Convert to fraction form
   10,425.78/14,386.99 = 5,709.15/x
3. Step 3: Cross multiply
   10,425.78x = 14,386.99 × 5,709.15
4. Step 4: Simplify right side
   10,425.78x = 82,137,483.96
5. Step 5: Solve for x
   x = 82,137,483.96/10,425.78
6. Step 6: Final answer
   x = 7,878.31