Finding the Fourth Proportional to 10,887.60, 16,350.56 and 10,731.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,887.60 : 16,350.56 = 10,731.78 : x
2. Step 2: Convert to fraction form
   10,887.60/16,350.56 = 10,731.78/x
3. Step 3: Cross multiply
   10,887.60x = 16,350.56 × 10,731.78
4. Step 4: Simplify right side
   10,887.60x = 175,470,559.14
5. Step 5: Solve for x
   x = 175,470,559.14/10,887.60
6. Step 6: Final answer
   x = 16,116.55