Finding the Fourth Proportional to 3,705.12, 5,106.72 and 3,391.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,705.12 : 5,106.72 = 3,391.23 : x
2. Step 2: Convert to fraction form
   3,705.12/5,106.72 = 3,391.23/x
3. Step 3: Cross multiply
   3,705.12x = 5,106.72 × 3,391.23
4. Step 4: Simplify right side
   3,705.12x = 17,318,062.07
5. Step 5: Solve for x
   x = 17,318,062.07/3,705.12
6. Step 6: Final answer
   x = 4,674.09