Finding the Fourth Proportional to 8,861.31, 13,291.16 and 2,705.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,861.31 : 13,291.16 = 2,705.31 : x
2. Step 2: Convert to fraction form
   8,861.31/13,291.16 = 2,705.31/x
3. Step 3: Cross multiply
   8,861.31x = 13,291.16 × 2,705.31
4. Step 4: Simplify right side
   8,861.31x = 35,956,694.53
5. Step 5: Solve for x
   x = 35,956,694.53/8,861.31
6. Step 6: Final answer
   x = 4,057.72