Finding the Fourth Proportional to 15,871.56, 21,902.72 and 8,701.47

Step by Step Solution

1. Step 1: Write the proportion equation
   15,871.56 : 21,902.72 = 8,701.47 : x
2. Step 2: Convert to fraction form
   15,871.56/21,902.72 = 8,701.47/x
3. Step 3: Cross multiply
   15,871.56x = 21,902.72 × 8,701.47
4. Step 4: Simplify right side
   15,871.56x = 190,585,817.49
5. Step 5: Solve for x
   x = 190,585,817.49/15,871.56
6. Step 6: Final answer
   x = 12,008.01