Finding the Fourth Proportional to 10,887.78, 16,303.99 and 7,178.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,887.78 : 16,303.99 = 7,178.78 : x
2. Step 2: Convert to fraction form
   10,887.78/16,303.99 = 7,178.78/x
3. Step 3: Cross multiply
   10,887.78x = 16,303.99 × 7,178.78
4. Step 4: Simplify right side
   10,887.78x = 117,042,757.33
5. Step 5: Solve for x
   x = 117,042,757.33/10,887.78
6. Step 6: Final answer
   x = 10,749.92