Finding the Fourth Proportional to 1,938.89, 2,909.61 and 1,279.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,938.89 : 2,909.61 = 1,279.32 : x
2. Step 2: Convert to fraction form
   1,938.89/2,909.61 = 1,279.32/x
3. Step 3: Cross multiply
   1,938.89x = 2,909.61 × 1,279.32
4. Step 4: Simplify right side
   1,938.89x = 3,722,322.27
5. Step 5: Solve for x
   x = 3,722,322.27/1,938.89
6. Step 6: Final answer
   x = 1,919.83