Finding the Fourth Proportional to 1,719.59, 2,578.60 and 939.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,719.59 : 2,578.60 = 939.86 : x
2. Step 2: Convert to fraction form
   1,719.59/2,578.60 = 939.86/x
3. Step 3: Cross multiply
   1,719.59x = 2,578.60 × 939.86
4. Step 4: Simplify right side
   1,719.59x = 2,423,505.40
5. Step 5: Solve for x
   x = 2,423,505.40/1,719.59
6. Step 6: Final answer
   x = 1,409.35