Finding the Fourth Proportional to 2,270.04, 3,132.72 and 1,385.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,270.04 : 3,132.72 = 1,385.20 : x
2. Step 2: Convert to fraction form
   2,270.04/3,132.72 = 1,385.20/x
3. Step 3: Cross multiply
   2,270.04x = 3,132.72 × 1,385.20
4. Step 4: Simplify right side
   2,270.04x = 4,339,443.74
5. Step 5: Solve for x
   x = 4,339,443.74/2,270.04
6. Step 6: Final answer
   x = 1,911.62