Finding the Third Proportional to 291,124.50 and 636,558

Step by Step Solution

1. Step 1: Write the proportion equation
   291,124.50 : 636,558 = 636,558 : x
2. Step 2: Convert to fraction form
   291,124.50/636,558 = 636,558/x
3. Step 3: Cross multiply
   291,124.50x = 636,558 × 636,558
4. Step 4: Simplify right side
   291,124.50x = 405,206,087,364
5. Step 5: Solve for x
   x = 405,206,087,364/291,124.50
6. Step 6: Final answer
   x = 1,391,865.29