Finding the Third Proportional to 388,813.50 and 808,650

Step by Step Solution

1. Step 1: Write the proportion equation
   388,813.50 : 808,650 = 808,650 : x
2. Step 2: Convert to fraction form
   388,813.50/808,650 = 808,650/x
3. Step 3: Cross multiply
   388,813.50x = 808,650 × 808,650
4. Step 4: Simplify right side
   388,813.50x = 653,914,822,500
5. Step 5: Solve for x
   x = 653,914,822,500/388,813.50
6. Step 6: Final answer
   x = 1,681,821.29