Finding the Fourth Proportional to 21,777.61, 30,053.69 and 12,823.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,777.61 : 30,053.69 = 12,823.47 : x
2. Step 2: Convert to fraction form
   21,777.61/30,053.69 = 12,823.47/x
3. Step 3: Cross multiply
   21,777.61x = 30,053.69 × 12,823.47
4. Step 4: Simplify right side
   21,777.61x = 385,392,592.10
5. Step 5: Solve for x
   x = 385,392,592.10/21,777.61
6. Step 6: Final answer
   x = 17,696.73