Finding the Third Proportional to 640,453.50 and 1,379,875.50

Step by Step Solution

1. Step 1: Write the proportion equation
   640,453.50 : 1,379,875.50 = 1,379,875.50 : x
2. Step 2: Convert to fraction form
   640,453.50/1,379,875.50 = 1,379,875.50/x
3. Step 3: Cross multiply
   640,453.50x = 1,379,875.50 × 1,379,875.50
4. Step 4: Simplify right side
   640,453.50x = 1,904,056,395,500.25
5. Step 5: Solve for x
   x = 1,904,056,395,500.25/640,453.50
6. Step 6: Final answer
   x = 2,972,981.48