Finding the Third Proportional to 292,646.25 and 638,472

Step by Step Solution

1. Step 1: Write the proportion equation
   292,646.25 : 638,472 = 638,472 : x
2. Step 2: Convert to fraction form
   292,646.25/638,472 = 638,472/x
3. Step 3: Cross multiply
   292,646.25x = 638,472 × 638,472
4. Step 4: Simplify right side
   292,646.25x = 407,646,494,784
5. Step 5: Solve for x
   x = 407,646,494,784/292,646.25
6. Step 6: Final answer
   x = 1,392,966.75