Finding the Fourth Proportional to 11,925.78, 16,456.82 and 6,620.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,925.78 : 16,456.82 = 6,620.60 : x
2. Step 2: Convert to fraction form
   11,925.78/16,456.82 = 6,620.60/x
3. Step 3: Cross multiply
   11,925.78x = 16,456.82 × 6,620.60
4. Step 4: Simplify right side
   11,925.78x = 108,953,907.10
5. Step 5: Solve for x
   x = 108,953,907.10/11,925.78
6. Step 6: Final answer
   x = 9,136.00