Finding the Fourth Proportional to 9,315.60, 12,856.56 and 5,539.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.60 : 12,856.56 = 5,539.68 : x
2. Step 2: Convert to fraction form
   9,315.60/12,856.56 = 5,539.68/x
3. Step 3: Cross multiply
   9,315.60x = 12,856.56 × 5,539.68
4. Step 4: Simplify right side
   9,315.60x = 71,221,228.30
5. Step 5: Solve for x
   x = 71,221,228.30/9,315.60
6. Step 6: Final answer
   x = 7,645.37