Finding the Third Proportional to 357,639 and 540,103.50

Step by Step Solution

1. Step 1: Write the proportion equation
   357,639 : 540,103.50 = 540,103.50 : x
2. Step 2: Convert to fraction form
   357,639/540,103.50 = 540,103.50/x
3. Step 3: Cross multiply
   357,639x = 540,103.50 × 540,103.50
4. Step 4: Simplify right side
   357,639x = 291,711,790,712.25
5. Step 5: Solve for x
   x = 291,711,790,712.25/357,639
6. Step 6: Final answer
   x = 815,659.90