Finding the Third Proportional to 663.31 and 1,440.69

Step by Step Solution

1. Step 1: Write the proportion equation
   663.31 : 1,440.69 = 1,440.69 : x
2. Step 2: Convert to fraction form
   663.31/1,440.69 = 1,440.69/x
3. Step 3: Cross multiply
   663.31x = 1,440.69 × 1,440.69
4. Step 4: Simplify right side
   663.31x = 2,075,580.47
5. Step 5: Solve for x
   x = 2,075,580.47/663.31
6. Step 6: Final answer
   x = 3,129.11