Finding the Fourth Proportional to 21,776.23, 30,042.56 and 12,809.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,776.23 : 30,042.56 = 12,809.53 : x
2. Step 2: Convert to fraction form
   21,776.23/30,042.56 = 12,809.53/x
3. Step 3: Cross multiply
   21,776.23x = 30,042.56 × 12,809.53
4. Step 4: Simplify right side
   21,776.23x = 384,831,073.60
5. Step 5: Solve for x
   x = 384,831,073.60/21,776.23
6. Step 6: Final answer
   x = 17,672.07