Finding the Fourth Proportional to 34,648.64, 51,941.78 and 12,456.80

Step by Step Solution

1. Step 1: Write the proportion equation
   34,648.64 : 51,941.78 = 12,456.80 : x
2. Step 2: Convert to fraction form
   34,648.64/51,941.78 = 12,456.80/x
3. Step 3: Cross multiply
   34,648.64x = 51,941.78 × 12,456.80
4. Step 4: Simplify right side
   34,648.64x = 647,028,365.10
5. Step 5: Solve for x
   x = 647,028,365.10/34,648.64
6. Step 6: Final answer
   x = 18,673.99