Finding the Fourth Proportional to 2,172.02, 3,257.20 and 939.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.02 : 3,257.20 = 939.34 : x
2. Step 2: Convert to fraction form
   2,172.02/3,257.20 = 939.34/x
3. Step 3: Cross multiply
   2,172.02x = 3,257.20 × 939.34
4. Step 4: Simplify right side
   2,172.02x = 3,059,618.25
5. Step 5: Solve for x
   x = 3,059,618.25/2,172.02
6. Step 6: Final answer
   x = 1,408.65