Finding the Fourth Proportional to 2,164.54, 2,987.40 and 1,380.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.54 : 2,987.40 = 1,380.46 : x
2. Step 2: Convert to fraction form
   2,164.54/2,987.40 = 1,380.46/x
3. Step 3: Cross multiply
   2,164.54x = 2,987.40 × 1,380.46
4. Step 4: Simplify right side
   2,164.54x = 4,123,986.20
5. Step 5: Solve for x
   x = 4,123,986.20/2,164.54
6. Step 6: Final answer
   x = 1,905.25