Finding the Fourth Proportional to 2,172.07, 3,256.89 and 938.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.07 : 3,256.89 = 938.71 : x
2. Step 2: Convert to fraction form
   2,172.07/3,256.89 = 938.71/x
3. Step 3: Cross multiply
   2,172.07x = 3,256.89 × 938.71
4. Step 4: Simplify right side
   2,172.07x = 3,057,275.21
5. Step 5: Solve for x
   x = 3,057,275.21/2,172.07
6. Step 6: Final answer
   x = 1,407.54