Finding the Fourth Proportional to 2,136.20, 2,947.30 and 1,297.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,136.20 : 2,947.30 = 1,297.40 : x
2. Step 2: Convert to fraction form
   2,136.20/2,947.30 = 1,297.40/x
3. Step 3: Cross multiply
   2,136.20x = 2,947.30 × 1,297.40
4. Step 4: Simplify right side
   2,136.20x = 3,823,809.04
5. Step 5: Solve for x
   x = 3,823,809.04/2,136.20
6. Step 6: Final answer
   x = 1,790.01