Finding the Fourth Proportional to 21,843.34, 32,766.72 and 7,806.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,843.34 : 32,766.72 = 7,806.40 : x
2. Step 2: Convert to fraction form
   21,843.34/32,766.72 = 7,806.40/x
3. Step 3: Cross multiply
   21,843.34x = 32,766.72 × 7,806.40
4. Step 4: Simplify right side
   21,843.34x = 255,790,123.01
5. Step 5: Solve for x
   x = 255,790,123.01/21,843.34
6. Step 6: Final answer
   x = 11,710.21