Finding the Third Proportional to 292,877.25 and 639,457

Step by Step Solution

1. Step 1: Write the proportion equation
   292,877.25 : 639,457 = 639,457 : x
2. Step 2: Convert to fraction form
   292,877.25/639,457 = 639,457/x
3. Step 3: Cross multiply
   292,877.25x = 639,457 × 639,457
4. Step 4: Simplify right side
   292,877.25x = 408,905,254,849
5. Step 5: Solve for x
   x = 408,905,254,849/292,877.25
6. Step 6: Final answer
   x = 1,396,165.99