Finding the Fourth Proportional to 1,440.71, 2,159.69 and 919.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.71 : 2,159.69 = 919.25 : x
2. Step 2: Convert to fraction form
   1,440.71/2,159.69 = 919.25/x
3. Step 3: Cross multiply
   1,440.71x = 2,159.69 × 919.25
4. Step 4: Simplify right side
   1,440.71x = 1,985,284.23
5. Step 5: Solve for x
   x = 1,985,284.23/1,440.71
6. Step 6: Final answer
   x = 1,377.99