Finding the Fourth Proportional to 8,279.22, 12,421.39 and 2,870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,279.22 : 12,421.39 = 2,870.05 : x
2. Step 2: Convert to fraction form
   8,279.22/12,421.39 = 2,870.05/x
3. Step 3: Cross multiply
   8,279.22x = 12,421.39 × 2,870.05
4. Step 4: Simplify right side
   8,279.22x = 35,650,010.37
5. Step 5: Solve for x
   x = 35,650,010.37/8,279.22
6. Step 6: Final answer
   x = 4,305.96