Finding the Fourth Proportional to 1,371.72, 2,055.40 and 1,064.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.72 : 2,055.40 = 1,064.40 : x
2. Step 2: Convert to fraction form
   1,371.72/2,055.40 = 1,064.40/x
3. Step 3: Cross multiply
   1,371.72x = 2,055.40 × 1,064.40
4. Step 4: Simplify right side
   1,371.72x = 2,187,767.76
5. Step 5: Solve for x
   x = 2,187,767.76/1,371.72
6. Step 6: Final answer
   x = 1,594.91