Finding the Third Proportional to 291,123 and 636,554.25

Step by Step Solution

1. Step 1: Write the proportion equation
   291,123 : 636,554.25 = 636,554.25 : x
2. Step 2: Convert to fraction form
   291,123/636,554.25 = 636,554.25/x
3. Step 3: Cross multiply
   291,123x = 636,554.25 × 636,554.25
4. Step 4: Simplify right side
   291,123x = 405,201,313,193.06
5. Step 5: Solve for x
   x = 405,201,313,193.06/291,123
6. Step 6: Final answer
   x = 1,391,856.06