Finding the Fourth Proportional to 12,256.86, 16,911.50 and 7,779

Step by Step Solution

1. Step 1: Write the proportion equation
   12,256.86 : 16,911.50 = 7,779 : x
2. Step 2: Convert to fraction form
   12,256.86/16,911.50 = 7,779/x
3. Step 3: Cross multiply
   12,256.86x = 16,911.50 × 7,779
4. Step 4: Simplify right side
   12,256.86x = 131,554,558.50
5. Step 5: Solve for x
   x = 131,554,558.50/12,256.86
6. Step 6: Final answer
   x = 10,733.14