Finding the Fourth Proportional to 10,998.72, 16,496.88 and 3,978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,998.72 : 16,496.88 = 3,978.48 : x
2. Step 2: Convert to fraction form
   10,998.72/16,496.88 = 3,978.48/x
3. Step 3: Cross multiply
   10,998.72x = 16,496.88 × 3,978.48
4. Step 4: Simplify right side
   10,998.72x = 65,632,507.14
5. Step 5: Solve for x
   x = 65,632,507.14/10,998.72
6. Step 6: Final answer
   x = 5,967.29