Finding the Fourth Proportional to 10,390.96, 15,656.57 and 8,582.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,390.96 : 15,656.57 = 8,582.59 : x
2. Step 2: Convert to fraction form
   10,390.96/15,656.57 = 8,582.59/x
3. Step 3: Cross multiply
   10,390.96x = 15,656.57 × 8,582.59
4. Step 4: Simplify right side
   10,390.96x = 134,373,842.83
5. Step 5: Solve for x
   x = 134,373,842.83/10,390.96
6. Step 6: Final answer
   x = 12,931.81