Finding the Fourth Proportional to 1,945.72, 2,685.09 and 1,247.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.72 : 2,685.09 = 1,247.09 : x
2. Step 2: Convert to fraction form
   1,945.72/2,685.09 = 1,247.09/x
3. Step 3: Cross multiply
   1,945.72x = 2,685.09 × 1,247.09
4. Step 4: Simplify right side
   1,945.72x = 3,348,562.07
5. Step 5: Solve for x
   x = 3,348,562.07/1,945.72
6. Step 6: Final answer
   x = 1,720.99