Finding the Fourth Proportional to 3,435.72, 5,152.31 and 2,120.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,435.72 : 5,152.31 = 2,120.18 : x
2. Step 2: Convert to fraction form
   3,435.72/5,152.31 = 2,120.18/x
3. Step 3: Cross multiply
   3,435.72x = 5,152.31 × 2,120.18
4. Step 4: Simplify right side
   3,435.72x = 10,923,796.20
5. Step 5: Solve for x
   x = 10,923,796.20/3,435.72
6. Step 6: Final answer
   x = 3,179.48