Finding the Fourth Proportional to 2,172.47, 3,258.06 and 939.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.47 : 3,258.06 = 939.58 : x
2. Step 2: Convert to fraction form
   2,172.47/3,258.06 = 939.58/x
3. Step 3: Cross multiply
   2,172.47x = 3,258.06 × 939.58
4. Step 4: Simplify right side
   2,172.47x = 3,061,218.51
5. Step 5: Solve for x
   x = 3,061,218.51/2,172.47
6. Step 6: Final answer
   x = 1,409.10