Finding the Fourth Proportional to 2,172.94, 3,260.22 and 939.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.94 : 3,260.22 = 939.86 : x
2. Step 2: Convert to fraction form
   2,172.94/3,260.22 = 939.86/x
3. Step 3: Cross multiply
   2,172.94x = 3,260.22 × 939.86
4. Step 4: Simplify right side
   2,172.94x = 3,064,150.37
5. Step 5: Solve for x
   x = 3,064,150.37/2,172.94
6. Step 6: Final answer
   x = 1,410.14