Finding the Fourth Proportional to 12,155.88, 16,775.16 and 7,681.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.88 : 16,775.16 = 7,681.62 : x
2. Step 2: Convert to fraction form
   12,155.88/16,775.16 = 7,681.62/x
3. Step 3: Cross multiply
   12,155.88x = 16,775.16 × 7,681.62
4. Step 4: Simplify right side
   12,155.88x = 128,860,404.56
5. Step 5: Solve for x
   x = 128,860,404.56/12,155.88
6. Step 6: Final answer
   x = 10,600.66