Finding the Third Proportional to 388,398 and 524,755.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,398 : 524,755.50 = 524,755.50 : x
2. Step 2: Convert to fraction form
   388,398/524,755.50 = 524,755.50/x
3. Step 3: Cross multiply
   388,398x = 524,755.50 × 524,755.50
4. Step 4: Simplify right side
   388,398x = 275,368,334,780.25
5. Step 5: Solve for x
   x = 275,368,334,780.25/388,398
6. Step 6: Final answer
   x = 708,984.95