Finding the Fourth Proportional to 2,142.10, 3,212.52 and 909.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.10 : 3,212.52 = 909.50 : x
2. Step 2: Convert to fraction form
   2,142.10/3,212.52 = 909.50/x
3. Step 3: Cross multiply
   2,142.10x = 3,212.52 × 909.50
4. Step 4: Simplify right side
   2,142.10x = 2,921,786.94
5. Step 5: Solve for x
   x = 2,921,786.94/2,142.10
6. Step 6: Final answer
   x = 1,363.98