Finding the Fourth Proportional to 10,647.45, 15,980.69 and 10,607.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,647.45 : 15,980.69 = 10,607.76 : x
2. Step 2: Convert to fraction form
   10,647.45/15,980.69 = 10,607.76/x
3. Step 3: Cross multiply
   10,647.45x = 15,980.69 × 10,607.76
4. Step 4: Simplify right side
   10,647.45x = 169,519,350.67
5. Step 5: Solve for x
   x = 169,519,350.67/10,647.45
6. Step 6: Final answer
   x = 15,921.12