Finding the Fourth Proportional to 1,451.16, 2,180.31 and 931.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,451.16 : 2,180.31 = 931.41 : x
2. Step 2: Convert to fraction form
   1,451.16/2,180.31 = 931.41/x
3. Step 3: Cross multiply
   1,451.16x = 2,180.31 × 931.41
4. Step 4: Simplify right side
   1,451.16x = 2,030,762.54
5. Step 5: Solve for x
   x = 2,030,762.54/1,451.16
6. Step 6: Final answer
   x = 1,399.41