Finding the Third Proportional to 278,919 and 572,539.50

Step by Step Solution

1. Step 1: Write the proportion equation
   278,919 : 572,539.50 = 572,539.50 : x
2. Step 2: Convert to fraction form
   278,919/572,539.50 = 572,539.50/x
3. Step 3: Cross multiply
   278,919x = 572,539.50 × 572,539.50
4. Step 4: Simplify right side
   278,919x = 327,801,479,060.25
5. Step 5: Solve for x
   x = 327,801,479,060.25/278,919
6. Step 6: Final answer
   x = 1,175,256.90