Finding the Third Proportional to 356,828 and 553,376.50

Step by Step Solution

1. Step 1: Write the proportion equation
   356,828 : 553,376.50 = 553,376.50 : x
2. Step 2: Convert to fraction form
   356,828/553,376.50 = 553,376.50/x
3. Step 3: Cross multiply
   356,828x = 553,376.50 × 553,376.50
4. Step 4: Simplify right side
   356,828x = 306,225,550,752.25
5. Step 5: Solve for x
   x = 306,225,550,752.25/356,828
6. Step 6: Final answer
   x = 858,188.12