Finding the Fourth Proportional to 1,461.13, 2,189.56 and 939.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,461.13 : 2,189.56 = 939.89 : x
2. Step 2: Convert to fraction form
   1,461.13/2,189.56 = 939.89/x
3. Step 3: Cross multiply
   1,461.13x = 2,189.56 × 939.89
4. Step 4: Simplify right side
   1,461.13x = 2,057,945.55
5. Step 5: Solve for x
   x = 2,057,945.55/1,461.13
6. Step 6: Final answer
   x = 1,408.46