Finding the Fourth Proportional to 15,929.94, 21,980.73 and 8,856.18

Step by Step Solution

1. Step 1: Write the proportion equation
   15,929.94 : 21,980.73 = 8,856.18 : x
2. Step 2: Convert to fraction form
   15,929.94/21,980.73 = 8,856.18/x
3. Step 3: Cross multiply
   15,929.94x = 21,980.73 × 8,856.18
4. Step 4: Simplify right side
   15,929.94x = 194,665,301.41
5. Step 5: Solve for x
   x = 194,665,301.41/15,929.94
6. Step 6: Final answer
   x = 12,220.09