Finding the Fourth Proportional to 15,870.96, 21,901.07 and 9,156.18

Step by Step Solution

1. Step 1: Write the proportion equation
   15,870.96 : 21,901.07 = 9,156.18 : x
2. Step 2: Convert to fraction form
   15,870.96/21,901.07 = 9,156.18/x
3. Step 3: Cross multiply
   15,870.96x = 21,901.07 × 9,156.18
4. Step 4: Simplify right side
   15,870.96x = 200,530,139.11
5. Step 5: Solve for x
   x = 200,530,139.11/15,870.96
6. Step 6: Final answer
   x = 12,635.04