Finding the Fourth Proportional to 21,665.28, 32,501.76 and 8,156.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.28 : 32,501.76 = 8,156.16 : x
2. Step 2: Convert to fraction form
   21,665.28/32,501.76 = 8,156.16/x
3. Step 3: Cross multiply
   21,665.28x = 32,501.76 × 8,156.16
4. Step 4: Simplify right side
   21,665.28x = 265,089,554.84
5. Step 5: Solve for x
   x = 265,089,554.84/21,665.28
6. Step 6: Final answer
   x = 12,235.69