Finding the Fourth Proportional to 8,706.31, 13,061.43 and 3,159.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,706.31 : 13,061.43 = 3,159.64 : x
2. Step 2: Convert to fraction form
   8,706.31/13,061.43 = 3,159.64/x
3. Step 3: Cross multiply
   8,706.31x = 13,061.43 × 3,159.64
4. Step 4: Simplify right side
   8,706.31x = 41,269,416.69
5. Step 5: Solve for x
   x = 41,269,416.69/8,706.31
6. Step 6: Final answer
   x = 4,740.17