Finding the Fourth Proportional to 3,450.21, 5,173.72 and 1,109.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,450.21 : 5,173.72 = 1,109.78 : x
2. Step 2: Convert to fraction form
   3,450.21/5,173.72 = 1,109.78/x
3. Step 3: Cross multiply
   3,450.21x = 5,173.72 × 1,109.78
4. Step 4: Simplify right side
   3,450.21x = 5,741,659.56
5. Step 5: Solve for x
   x = 5,741,659.56/3,450.21
6. Step 6: Final answer
   x = 1,664.15