Finding the Third Proportional to 456,790 and 670,254

Step by Step Solution

1. Step 1: Write the proportion equation
   456,790 : 670,254 = 670,254 : x
2. Step 2: Convert to fraction form
   456,790/670,254 = 670,254/x
3. Step 3: Cross multiply
   456,790x = 670,254 × 670,254
4. Step 4: Simplify right side
   456,790x = 449,240,424,516
5. Step 5: Solve for x
   x = 449,240,424,516/456,790
6. Step 6: Final answer
   x = 983,472.55