Finding the Fourth Proportional to 2,160.69, 3,238.28 and 1,380.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.69 : 3,238.28 = 1,380.45 : x
2. Step 2: Convert to fraction form
   2,160.69/3,238.28 = 1,380.45/x
3. Step 3: Cross multiply
   2,160.69x = 3,238.28 × 1,380.45
4. Step 4: Simplify right side
   2,160.69x = 4,470,283.63
5. Step 5: Solve for x
   x = 4,470,283.63/2,160.69
6. Step 6: Final answer
   x = 2,068.91