Finding the Fourth Proportional to 21,782.28, 32,632.28 and 12,871

Step by Step Solution

1. Step 1: Write the proportion equation
   21,782.28 : 32,632.28 = 12,871 : x
2. Step 2: Convert to fraction form
   21,782.28/32,632.28 = 12,871/x
3. Step 3: Cross multiply
   21,782.28x = 32,632.28 × 12,871
4. Step 4: Simplify right side
   21,782.28x = 420,010,075.88
5. Step 5: Solve for x
   x = 420,010,075.88/21,782.28
6. Step 6: Final answer
   x = 19,282.19