Finding the Fourth Proportional to 16,771.02, 25,120.71 and 12,777.90

Step by Step Solution

1. Step 1: Write the proportion equation
   16,771.02 : 25,120.71 = 12,777.90 : x
2. Step 2: Convert to fraction form
   16,771.02/25,120.71 = 12,777.90/x
3. Step 3: Cross multiply
   16,771.02x = 25,120.71 × 12,777.90
4. Step 4: Simplify right side
   16,771.02x = 320,989,920.31
5. Step 5: Solve for x
   x = 320,989,920.31/16,771.02
6. Step 6: Final answer
   x = 19,139.56