Finding the Fourth Proportional to 1,940.81, 2,911.71 and 554.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,940.81 : 2,911.71 = 554.15 : x
2. Step 2: Convert to fraction form
   1,940.81/2,911.71 = 554.15/x
3. Step 3: Cross multiply
   1,940.81x = 2,911.71 × 554.15
4. Step 4: Simplify right side
   1,940.81x = 1,613,524.10
5. Step 5: Solve for x
   x = 1,613,524.10/1,940.81
6. Step 6: Final answer
   x = 831.37