Finding the Fourth Proportional to 1,439.30, 2,159.82 and 514.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.30 : 2,159.82 = 514.79 : x
2. Step 2: Convert to fraction form
   1,439.30/2,159.82 = 514.79/x
3. Step 3: Cross multiply
   1,439.30x = 2,159.82 × 514.79
4. Step 4: Simplify right side
   1,439.30x = 1,111,842.94
5. Step 5: Solve for x
   x = 1,111,842.94/1,439.30
6. Step 6: Final answer
   x = 772.49