Finding the Fourth Proportional to 1,945.37, 2,683.89 and 1,247.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.37 : 2,683.89 = 1,247.15 : x
2. Step 2: Convert to fraction form
   1,945.37/2,683.89 = 1,247.15/x
3. Step 3: Cross multiply
   1,945.37x = 2,683.89 × 1,247.15
4. Step 4: Simplify right side
   1,945.37x = 3,347,220.12
5. Step 5: Solve for x
   x = 3,347,220.12/1,945.37
6. Step 6: Final answer
   x = 1,720.61