Finding the Fourth Proportional to 8,585.06, 12,870.27 and 8,337.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,585.06 : 12,870.27 = 8,337.20 : x
2. Step 2: Convert to fraction form
   8,585.06/12,870.27 = 8,337.20/x
3. Step 3: Cross multiply
   8,585.06x = 12,870.27 × 8,337.20
4. Step 4: Simplify right side
   8,585.06x = 107,301,950.69
5. Step 5: Solve for x
   x = 107,301,950.69/8,585.06
6. Step 6: Final answer
   x = 12,498.69