Finding the Fourth Proportional to 1,406.30, 1,940.54 and 839.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.30 : 1,940.54 = 839.03 : x
2. Step 2: Convert to fraction form
   1,406.30/1,940.54 = 839.03/x
3. Step 3: Cross multiply
   1,406.30x = 1,940.54 × 839.03
4. Step 4: Simplify right side
   1,406.30x = 1,628,157.38
5. Step 5: Solve for x
   x = 1,628,157.38/1,406.30
6. Step 6: Final answer
   x = 1,157.76