Finding the Third Proportional to 291,478.50 and 636,957

Step by Step Solution

1. Step 1: Write the proportion equation
   291,478.50 : 636,957 = 636,957 : x
2. Step 2: Convert to fraction form
   291,478.50/636,957 = 636,957/x
3. Step 3: Cross multiply
   291,478.50x = 636,957 × 636,957
4. Step 4: Simplify right side
   291,478.50x = 405,714,219,849
5. Step 5: Solve for x
   x = 405,714,219,849/291,478.50
6. Step 6: Final answer
   x = 1,391,918.17