Finding the Fourth Proportional to 8,587.08, 12,870.72 and 3,900.06

Step by Step Solution

1. Step 1: Write the proportion equation
   8,587.08 : 12,870.72 = 3,900.06 : x
2. Step 2: Convert to fraction form
   8,587.08/12,870.72 = 3,900.06/x
3. Step 3: Cross multiply
   8,587.08x = 12,870.72 × 3,900.06
4. Step 4: Simplify right side
   8,587.08x = 50,196,580.24
5. Step 5: Solve for x
   x = 50,196,580.24/8,587.08
6. Step 6: Final answer
   x = 5,845.59