Finding the Fourth Proportional to 10,905.12, 16,354.44 and 3,978

Step by Step Solution

1. Step 1: Write the proportion equation
   10,905.12 : 16,354.44 = 3,978 : x
2. Step 2: Convert to fraction form
   10,905.12/16,354.44 = 3,978/x
3. Step 3: Cross multiply
   10,905.12x = 16,354.44 × 3,978
4. Step 4: Simplify right side
   10,905.12x = 65,057,962.32
5. Step 5: Solve for x
   x = 65,057,962.32/10,905.12
6. Step 6: Final answer
   x = 5,965.82