Finding the Fourth Proportional to 15,871.02, 21,900.12 and 9,156.96

Step by Step Solution

1. Step 1: Write the proportion equation
   15,871.02 : 21,900.12 = 9,156.96 : x
2. Step 2: Convert to fraction form
   15,871.02/21,900.12 = 9,156.96/x
3. Step 3: Cross multiply
   15,871.02x = 21,900.12 × 9,156.96
4. Step 4: Simplify right side
   15,871.02x = 200,538,522.84
5. Step 5: Solve for x
   x = 200,538,522.84/15,871.02
6. Step 6: Final answer
   x = 12,635.52