Finding the Fourth Proportional to 3,851.31, 5,314.56 and 2,172.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,851.31 : 5,314.56 = 2,172.86 : x
2. Step 2: Convert to fraction form
   3,851.31/5,314.56 = 2,172.86/x
3. Step 3: Cross multiply
   3,851.31x = 5,314.56 × 2,172.86
4. Step 4: Simplify right side
   3,851.31x = 11,547,814.69
5. Step 5: Solve for x
   x = 11,547,814.69/3,851.31
6. Step 6: Final answer
   x = 2,998.41