Finding the Third Proportional to 386,610.50 and 808,430

Step by Step Solution

1. Step 1: Write the proportion equation
   386,610.50 : 808,430 = 808,430 : x
2. Step 2: Convert to fraction form
   386,610.50/808,430 = 808,430/x
3. Step 3: Cross multiply
   386,610.50x = 808,430 × 808,430
4. Step 4: Simplify right side
   386,610.50x = 653,559,064,900
5. Step 5: Solve for x
   x = 653,559,064,900/386,610.50
6. Step 6: Final answer
   x = 1,690,484.52