Finding the Fourth Proportional to 21,778.28, 30,050.92 and 12,345

Step by Step Solution

1. Step 1: Write the proportion equation
   21,778.28 : 30,050.92 = 12,345 : x
2. Step 2: Convert to fraction form
   21,778.28/30,050.92 = 12,345/x
3. Step 3: Cross multiply
   21,778.28x = 30,050.92 × 12,345
4. Step 4: Simplify right side
   21,778.28x = 370,978,607.40
5. Step 5: Solve for x
   x = 370,978,607.40/21,778.28
6. Step 6: Final answer
   x = 17,034.34