Finding the Third Proportional to 293,076 and 638,637.75

Step by Step Solution

1. Step 1: Write the proportion equation
   293,076 : 638,637.75 = 638,637.75 : x
2. Step 2: Convert to fraction form
   293,076/638,637.75 = 638,637.75/x
3. Step 3: Cross multiply
   293,076x = 638,637.75 × 638,637.75
4. Step 4: Simplify right side
   293,076x = 407,858,175,725.06
5. Step 5: Solve for x
   x = 407,858,175,725.06/293,076
6. Step 6: Final answer
   x = 1,391,646.45