Finding the Fourth Proportional to 10,786.03, 16,158.31 and 7,777.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,786.03 : 16,158.31 = 7,777.55 : x
2. Step 2: Convert to fraction form
   10,786.03/16,158.31 = 7,777.55/x
3. Step 3: Cross multiply
   10,786.03x = 16,158.31 × 7,777.55
4. Step 4: Simplify right side
   10,786.03x = 125,672,084.89
5. Step 5: Solve for x
   x = 125,672,084.89/10,786.03
6. Step 6: Final answer
   x = 11,651.38