Finding the Fourth Proportional to 2,130.40, 2,939.82 and 1,246.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,130.40 : 2,939.82 = 1,246.15 : x
2. Step 2: Convert to fraction form
   2,130.40/2,939.82 = 1,246.15/x
3. Step 3: Cross multiply
   2,130.40x = 2,939.82 × 1,246.15
4. Step 4: Simplify right side
   2,130.40x = 3,663,456.69
5. Step 5: Solve for x
   x = 3,663,456.69/2,130.40
6. Step 6: Final answer
   x = 1,719.61