Finding the Third Proportional to 355,839 and 550,387.50

Step by Step Solution

1. Step 1: Write the proportion equation
   355,839 : 550,387.50 = 550,387.50 : x
2. Step 2: Convert to fraction form
   355,839/550,387.50 = 550,387.50/x
3. Step 3: Cross multiply
   355,839x = 550,387.50 × 550,387.50
4. Step 4: Simplify right side
   355,839x = 302,926,400,156.25
5. Step 5: Solve for x
   x = 302,926,400,156.25/355,839
6. Step 6: Final answer
   x = 851,301.85