Finding the Fourth Proportional to 1,638.56, 2,260.38 and 939.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.56 : 2,260.38 = 939.50 : x
2. Step 2: Convert to fraction form
   1,638.56/2,260.38 = 939.50/x
3. Step 3: Cross multiply
   1,638.56x = 2,260.38 × 939.50
4. Step 4: Simplify right side
   1,638.56x = 2,123,627.01
5. Step 5: Solve for x
   x = 2,123,627.01/1,638.56
6. Step 6: Final answer
   x = 1,296.03