Finding the Fourth Proportional to 2,217.40, 3,329.86 and 2,129.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.40 : 3,329.86 = 2,129.12 : x
2. Step 2: Convert to fraction form
   2,217.40/3,329.86 = 2,129.12/x
3. Step 3: Cross multiply
   2,217.40x = 3,329.86 × 2,129.12
4. Step 4: Simplify right side
   2,217.40x = 7,089,671.52
5. Step 5: Solve for x
   x = 7,089,671.52/2,217.40
6. Step 6: Final answer
   x = 3,197.29