Finding the Fourth Proportional to 10,489.05, 14,475.15 and 5,709.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,489.05 : 14,475.15 = 5,709.30 : x
2. Step 2: Convert to fraction form
   10,489.05/14,475.15 = 5,709.30/x
3. Step 3: Cross multiply
   10,489.05x = 14,475.15 × 5,709.30
4. Step 4: Simplify right side
   10,489.05x = 82,642,973.90
5. Step 5: Solve for x
   x = 82,642,973.90/10,489.05
6. Step 6: Final answer
   x = 7,878.98