Finding the Third Proportional to 640,989 and 996,448.50

Step by Step Solution

1. Step 1: Write the proportion equation
   640,989 : 996,448.50 = 996,448.50 : x
2. Step 2: Convert to fraction form
   640,989/996,448.50 = 996,448.50/x
3. Step 3: Cross multiply
   640,989x = 996,448.50 × 996,448.50
4. Step 4: Simplify right side
   640,989x = 992,909,613,152.25
5. Step 5: Solve for x
   x = 992,909,613,152.25/640,989
6. Step 6: Final answer
   x = 1,549,027.54