Finding the Fourth Proportional to 10,128.30, 15,168.96 and 9,777.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.30 : 15,168.96 = 9,777.89 : x
2. Step 2: Convert to fraction form
   10,128.30/15,168.96 = 9,777.89/x
3. Step 3: Cross multiply
   10,128.30x = 15,168.96 × 9,777.89
4. Step 4: Simplify right side
   10,128.30x = 148,320,346.45
5. Step 5: Solve for x
   x = 148,320,346.45/10,128.30
6. Step 6: Final answer
   x = 14,644.15