Finding the Fourth Proportional to 1,939.30, 2,674.38 and 1,309.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939.30 : 2,674.38 = 1,309.93 : x
2. Step 2: Convert to fraction form
   1,939.30/2,674.38 = 1,309.93/x
3. Step 3: Cross multiply
   1,939.30x = 2,674.38 × 1,309.93
4. Step 4: Simplify right side
   1,939.30x = 3,503,250.59
5. Step 5: Solve for x
   x = 3,503,250.59/1,939.30
6. Step 6: Final answer
   x = 1,806.45