Finding the Third Proportional to 291,081.75 and 636,262.50

Step by Step Solution

1. Step 1: Write the proportion equation
   291,081.75 : 636,262.50 = 636,262.50 : x
2. Step 2: Convert to fraction form
   291,081.75/636,262.50 = 636,262.50/x
3. Step 3: Cross multiply
   291,081.75x = 636,262.50 × 636,262.50
4. Step 4: Simplify right side
   291,081.75x = 404,829,968,906.25
5. Step 5: Solve for x
   x = 404,829,968,906.25/291,081.75
6. Step 6: Final answer
   x = 1,390,777.57