Finding the Fourth Proportional to 2,172.86, 3,256.86 and 938.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.86 : 3,256.86 = 938.42 : x
2. Step 2: Convert to fraction form
   2,172.86/3,256.86 = 938.42/x
3. Step 3: Cross multiply
   2,172.86x = 3,256.86 × 938.42
4. Step 4: Simplify right side
   2,172.86x = 3,056,296.73
5. Step 5: Solve for x
   x = 3,056,296.73/2,172.86
6. Step 6: Final answer
   x = 1,406.58