Finding the Fourth Proportional to 1,478.38, 2,039.33 and 939.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.38 : 2,039.33 = 939.02 : x
2. Step 2: Convert to fraction form
   1,478.38/2,039.33 = 939.02/x
3. Step 3: Cross multiply
   1,478.38x = 2,039.33 × 939.02
4. Step 4: Simplify right side
   1,478.38x = 1,914,961.46
5. Step 5: Solve for x
   x = 1,914,961.46/1,478.38
6. Step 6: Final answer
   x = 1,295.32