Finding the Third Proportional to 295,128 and 642,811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   295,128 : 642,811.50 = 642,811.50 : x
2. Step 2: Convert to fraction form
   295,128/642,811.50 = 642,811.50/x
3. Step 3: Cross multiply
   295,128x = 642,811.50 × 642,811.50
4. Step 4: Simplify right side
   295,128x = 413,206,624,532.25
5. Step 5: Solve for x
   x = 413,206,624,532.25/295,128
6. Step 6: Final answer
   x = 1,400,092.92